diff --git a/coretk/coretk/app.py b/coretk/coretk/app.py
index 0a9275f1..7c2562a9 100644
--- a/coretk/coretk/app.py
+++ b/coretk/coretk/app.py
@@ -14,6 +14,9 @@ from coretk.statusbar import StatusBar
 from coretk.toolbar import Toolbar
 from coretk.validation import InputValidation
 
+WIDTH = 1000
+HEIGHT = 800
+
 
 class Application(tk.Frame):
     def __init__(self, master=None):
@@ -40,7 +43,7 @@ class Application(tk.Frame):
     def setup_theme(self):
         themes.load(self.style)
         self.style.theme_use(self.guiconfig["preferences"]["theme"])
-        func = partial(themes.update_menu, self.style)
+        func = partial(themes.theme_change_menu, self.style)
         self.master.bind_class("Menu", "<<ThemeChanged>>", func)
         func = partial(themes.theme_change, self.style)
         self.master.bind("<<ThemeChanged>>", func)
@@ -55,13 +58,11 @@ class Application(tk.Frame):
         self.validation = InputValidation(self)
 
     def center(self):
-        width = 1000
-        height = 800
         screen_width = self.master.winfo_screenwidth()
         screen_height = self.master.winfo_screenheight()
-        x = int((screen_width / 2) - (width / 2))
-        y = int((screen_height / 2) - (height / 2))
-        self.master.geometry(f"{width}x{height}+{x}+{y}")
+        x = int((screen_width / 2) - (WIDTH / 2))
+        y = int((screen_height / 2) - (HEIGHT / 2))
+        self.master.geometry(f"{WIDTH}x{HEIGHT}+{x}+{y}")
 
     def draw(self):
         self.master.option_add("*tearOff", tk.FALSE)
diff --git a/coretk/coretk/dialogs/canvassizeandscale.py b/coretk/coretk/dialogs/canvassizeandscale.py
index 2798f6f2..1fcfff59 100644
--- a/coretk/coretk/dialogs/canvassizeandscale.py
+++ b/coretk/coretk/dialogs/canvassizeandscale.py
@@ -46,6 +46,7 @@ class SizeAndScaleDialog(Dialog):
         self.draw_scale()
         self.draw_reference_point()
         self.draw_save_as_default()
+        self.draw_spacer()
         self.draw_buttons()
 
     def draw_size(self):
diff --git a/coretk/coretk/dialogs/canvasbackground.py b/coretk/coretk/dialogs/canvaswallpaper.py
similarity index 90%
rename from coretk/coretk/dialogs/canvasbackground.py
rename to coretk/coretk/dialogs/canvaswallpaper.py
index 844b5595..bf6bf922 100644
--- a/coretk/coretk/dialogs/canvasbackground.py
+++ b/coretk/coretk/dialogs/canvaswallpaper.py
@@ -9,7 +9,7 @@ from coretk.appconfig import BACKGROUNDS_PATH
 from coretk.dialogs.dialog import Dialog
 from coretk.images import Images
 
-PADX = 5
+PAD = 5
 
 
 class CanvasBackgroundDialog(Dialog):
@@ -36,17 +36,18 @@ class CanvasBackgroundDialog(Dialog):
         self.draw_image_selection()
         self.draw_options()
         self.draw_additional_options()
+        self.draw_spacer()
         self.draw_buttons()
 
     def draw_image(self):
         self.image_label = ttk.Label(
             self.top, text="(image preview)", width=32, anchor=tk.CENTER
         )
-        self.image_label.grid(row=0, column=0, pady=5)
+        self.image_label.grid(pady=PAD)
 
     def draw_image_label(self):
         label = ttk.Label(self.top, text="Image filename: ")
-        label.grid(row=1, column=0, sticky="ew")
+        label.grid(sticky="ew")
         if self.filename.get():
             self.draw_preview()
 
@@ -55,14 +56,14 @@ class CanvasBackgroundDialog(Dialog):
         frame.columnconfigure(0, weight=2)
         frame.columnconfigure(1, weight=1)
         frame.columnconfigure(2, weight=1)
-        frame.grid(row=2, column=0, sticky="ew")
+        frame.grid(sticky="ew")
 
         entry = ttk.Entry(frame, textvariable=self.filename)
         entry.focus()
-        entry.grid(row=0, column=0, sticky="ew", padx=PADX)
+        entry.grid(row=0, column=0, sticky="ew", padx=PAD)
 
         button = ttk.Button(frame, text="...", command=self.click_open_image)
-        button.grid(row=0, column=1, sticky="ew", padx=PADX)
+        button.grid(row=0, column=1, sticky="ew", padx=PAD)
 
         button = ttk.Button(frame, text="Clear", command=self.click_clear)
         button.grid(row=0, column=2, sticky="ew")
@@ -73,7 +74,7 @@ class CanvasBackgroundDialog(Dialog):
         frame.columnconfigure(1, weight=1)
         frame.columnconfigure(2, weight=1)
         frame.columnconfigure(3, weight=1)
-        frame.grid(row=3, column=0, sticky="ew")
+        frame.grid(sticky="ew")
 
         button = ttk.Radiobutton(
             frame, text="upper-left", value=1, variable=self.scale_option
@@ -103,7 +104,7 @@ class CanvasBackgroundDialog(Dialog):
         checkbutton = ttk.Checkbutton(
             self.top, text="Show grid", variable=self.show_grid
         )
-        checkbutton.grid(row=4, column=0, sticky="ew", padx=PADX)
+        checkbutton.grid(sticky="ew", padx=PAD)
 
         checkbutton = ttk.Checkbutton(
             self.top,
@@ -111,16 +112,16 @@ class CanvasBackgroundDialog(Dialog):
             variable=self.adjust_to_dim,
             command=self.click_adjust_canvas,
         )
-        checkbutton.grid(row=5, column=0, sticky="ew", padx=PADX)
+        checkbutton.grid(sticky="ew", padx=PAD)
 
     def draw_buttons(self):
         frame = ttk.Frame(self.top)
-        frame.grid(row=6, column=0, pady=5, sticky="ew")
+        frame.grid(pady=PAD, sticky="ew")
         frame.columnconfigure(0, weight=1)
         frame.columnconfigure(1, weight=1)
 
         button = ttk.Button(frame, text="Apply", command=self.click_apply)
-        button.grid(row=0, column=0, sticky="ew", padx=PADX)
+        button.grid(row=0, column=0, sticky="ew", padx=PAD)
 
         button = ttk.Button(frame, text="Cancel", command=self.destroy)
         button.grid(row=0, column=1, sticky="ew")
diff --git a/coretk/coretk/dialogs/customnodes.py b/coretk/coretk/dialogs/customnodes.py
index dbf431d3..75052e6b 100644
--- a/coretk/coretk/dialogs/customnodes.py
+++ b/coretk/coretk/dialogs/customnodes.py
@@ -8,6 +8,8 @@ from coretk.dialogs.icondialog import IconDialog
 from coretk.nodeutils import NodeDraw
 from coretk.widgets import CheckboxList, ListboxScroll
 
+PAD = 5
+
 
 class ServicesSelectDialog(Dialog):
     def __init__(self, master, app, current_services):
@@ -23,11 +25,11 @@ class ServicesSelectDialog(Dialog):
         self.top.rowconfigure(0, weight=1)
 
         frame = ttk.Frame(self.top)
-        frame.grid(stick="nsew")
+        frame.grid(stick="nsew", pady=PAD)
         frame.rowconfigure(0, weight=1)
         for i in range(3):
             frame.columnconfigure(i, weight=1)
-        self.groups = ListboxScroll(frame, text="Groups")
+        self.groups = ListboxScroll(frame, text="Groups", padding=PAD)
         self.groups.grid(row=0, column=0, sticky="nsew")
         for group in sorted(self.app.core.services):
             self.groups.listbox.insert(tk.END, group)
@@ -35,11 +37,11 @@ class ServicesSelectDialog(Dialog):
         self.groups.listbox.selection_set(0)
 
         self.services = CheckboxList(
-            frame, self.app, text="Services", clicked=self.service_clicked
+            frame, self.app, text="Services", clicked=self.service_clicked, padding=PAD
         )
         self.services.grid(row=0, column=1, sticky="nsew")
 
-        self.current = ListboxScroll(frame, text="Selected")
+        self.current = ListboxScroll(frame, text="Selected", padding=PAD)
         self.current.grid(row=0, column=2, sticky="nsew")
         for service in sorted(self.current_services):
             self.current.listbox.insert(tk.END, service)
@@ -49,7 +51,7 @@ class ServicesSelectDialog(Dialog):
         for i in range(2):
             frame.columnconfigure(i, weight=1)
         button = ttk.Button(frame, text="Save", command=self.destroy)
-        button.grid(row=0, column=0, sticky="ew")
+        button.grid(row=0, column=0, sticky="ew", padx=PAD)
         button = ttk.Button(frame, text="Cancel", command=self.click_cancel)
         button.grid(row=0, column=1, sticky="ew")
 
@@ -104,12 +106,12 @@ class CustomNodesDialog(Dialog):
 
     def draw_node_config(self):
         frame = ttk.Frame(self.top)
-        frame.grid(sticky="nsew")
+        frame.grid(sticky="nsew", pady=PAD)
         frame.columnconfigure(0, weight=1)
         frame.rowconfigure(0, weight=1)
 
-        self.nodes_list = ListboxScroll(frame, text="Nodes")
-        self.nodes_list.grid(row=0, column=0, sticky="nsew")
+        self.nodes_list = ListboxScroll(frame, text="Nodes", padding=PAD)
+        self.nodes_list.grid(row=0, column=0, sticky="nsew", padx=PAD)
         self.nodes_list.listbox.bind("<<ListboxSelect>>", self.handle_node_select)
         for name in sorted(self.app.core.custom_nodes):
             self.nodes_list.listbox.insert(tk.END, name)
@@ -128,17 +130,17 @@ class CustomNodesDialog(Dialog):
 
     def draw_node_buttons(self):
         frame = ttk.Frame(self.top)
-        frame.grid(pady=2, sticky="ew")
+        frame.grid(sticky="ew", pady=PAD)
         for i in range(3):
             frame.columnconfigure(i, weight=1)
 
         button = ttk.Button(frame, text="Create", command=self.click_create)
-        button.grid(row=0, column=0, sticky="ew")
+        button.grid(row=0, column=0, sticky="ew", padx=PAD)
 
         self.edit_button = ttk.Button(
             frame, text="Edit", state=tk.DISABLED, command=self.click_edit
         )
-        self.edit_button.grid(row=0, column=1, sticky="ew")
+        self.edit_button.grid(row=0, column=1, sticky="ew", padx=PAD)
 
         self.delete_button = ttk.Button(
             frame, text="Delete", state=tk.DISABLED, command=self.click_delete
@@ -152,7 +154,7 @@ class CustomNodesDialog(Dialog):
             frame.columnconfigure(i, weight=1)
 
         button = ttk.Button(frame, text="Save", command=self.click_save)
-        button.grid(row=0, column=0, sticky="ew")
+        button.grid(row=0, column=0, sticky="ew", padx=PAD)
 
         button = ttk.Button(frame, text="Cancel", command=self.destroy)
         button.grid(row=0, column=1, sticky="ew")
diff --git a/coretk/coretk/dialogs/dialog.py b/coretk/coretk/dialogs/dialog.py
index 29362960..49662cc4 100644
--- a/coretk/coretk/dialogs/dialog.py
+++ b/coretk/coretk/dialogs/dialog.py
@@ -30,3 +30,9 @@ class Dialog(tk.Toplevel):
             self.wait_visibility()
             self.grab_set()
             self.wait_window()
+
+    def draw_spacer(self, row=None):
+        frame = ttk.Frame(self.top)
+        frame.grid(row=row, sticky="nsew")
+        frame.rowconfigure(0, weight=1)
+        self.top.rowconfigure(frame.grid_info()["row"], weight=1)
diff --git a/coretk/coretk/dialogs/emaneconfig.py b/coretk/coretk/dialogs/emaneconfig.py
index a9042ba3..b16f7cd4 100644
--- a/coretk/coretk/dialogs/emaneconfig.py
+++ b/coretk/coretk/dialogs/emaneconfig.py
@@ -25,11 +25,10 @@ class GlobalEmaneDialog(Dialog):
     def draw(self):
         self.top.columnconfigure(0, weight=1)
         self.top.rowconfigure(0, weight=1)
-        self.config_frame = ConfigFrame(
-            self.top, self.app, self.app.core.emane_config, borderwidth=0
-        )
+        self.config_frame = ConfigFrame(self.top, self.app, self.app.core.emane_config)
         self.config_frame.draw_config()
         self.config_frame.grid(sticky="nsew", pady=PAD)
+        self.draw_spacer()
         self.draw_buttons()
 
     def draw_buttons(self):
@@ -67,9 +66,10 @@ class EmaneModelDialog(Dialog):
     def draw(self):
         self.top.columnconfigure(0, weight=1)
         self.top.rowconfigure(0, weight=1)
-        self.config_frame = ConfigFrame(self.top, self.app, self.config, borderwidth=0)
+        self.config_frame = ConfigFrame(self.top, self.app, self.config)
         self.config_frame.draw_config()
         self.config_frame.grid(sticky="nsew", pady=PAD)
+        self.draw_spacer()
         self.draw_buttons()
 
     def draw_buttons(self):
@@ -111,6 +111,7 @@ class EmaneConfigDialog(Dialog):
         self.draw_emane_configuration()
         self.draw_emane_models()
         self.draw_emane_buttons()
+        self.draw_spacer()
         self.draw_apply_and_cancel()
 
     def draw_emane_configuration(self):
@@ -123,8 +124,9 @@ class EmaneConfigDialog(Dialog):
             self.top,
             text="The EMANE emulation system provides more complex wireless radio emulation "
             "\nusing pluggable MAC and PHY modules. Refer to the wiki for configuration option details",
+            justify=tk.CENTER,
         )
-        label.grid(sticky="ew", pady=PAD)
+        label.grid(pady=PAD)
 
         image = Images.get(ImageEnum.EDITNODE, 16)
         button = ttk.Button(
diff --git a/coretk/coretk/dialogs/hooks.py b/coretk/coretk/dialogs/hooks.py
index d40f1c36..2850d70e 100644
--- a/coretk/coretk/dialogs/hooks.py
+++ b/coretk/coretk/dialogs/hooks.py
@@ -5,6 +5,8 @@ from core.api.grpc import core_pb2
 from coretk.dialogs.dialog import Dialog
 from coretk.widgets import CodeText
 
+PAD = 5
+
 
 class HookDialog(Dialog):
     def __init__(self, master, app):
@@ -21,14 +23,14 @@ class HookDialog(Dialog):
 
         # name and states
         frame = ttk.Frame(self.top)
-        frame.grid(row=0, sticky="ew", pady=2)
+        frame.grid(sticky="ew", pady=PAD)
         frame.columnconfigure(0, weight=2)
         frame.columnconfigure(1, weight=7)
         frame.columnconfigure(2, weight=1)
         label = ttk.Label(frame, text="Name")
-        label.grid(row=0, column=0, sticky="ew")
+        label.grid(row=0, column=0, sticky="ew", padx=PAD)
         entry = ttk.Entry(frame, textvariable=self.name)
-        entry.grid(row=0, column=1, sticky="ew")
+        entry.grid(row=0, column=1, sticky="ew", padx=PAD)
         values = tuple(x for x in core_pb2.SessionState.Enum.keys() if x != "NONE")
         initial_state = core_pb2.SessionState.Enum.Name(core_pb2.SessionState.RUNTIME)
         self.state.set(initial_state)
@@ -40,11 +42,7 @@ class HookDialog(Dialog):
         combobox.bind("<<ComboboxSelected>>", self.state_change)
 
         # data
-        frame = ttk.Frame(self.top)
-        frame.columnconfigure(0, weight=1)
-        frame.rowconfigure(0, weight=1)
-        frame.grid(row=1, sticky="nsew", pady=2)
-        self.data = CodeText(frame)
+        self.data = CodeText(self.top)
         self.data.insert(
             1.0,
             (
@@ -53,19 +51,15 @@ class HookDialog(Dialog):
                 "# specified state\n"
             ),
         )
-        self.data.grid(row=0, column=0, sticky="nsew")
-        scrollbar = ttk.Scrollbar(frame)
-        scrollbar.grid(row=0, column=1, sticky="ns")
-        self.data.config(yscrollcommand=scrollbar.set)
-        scrollbar.config(command=self.data.yview)
+        self.data.grid(sticky="nsew")
 
         # button row
         frame = ttk.Frame(self.top)
-        frame.grid(row=2, sticky="ew", pady=2)
+        frame.grid(sticky="ew")
         for i in range(2):
             frame.columnconfigure(i, weight=1)
         button = ttk.Button(frame, text="Save", command=lambda: self.save())
-        button.grid(row=0, column=0, sticky="ew")
+        button.grid(row=0, column=0, sticky="ew", padx=PAD)
         button = ttk.Button(frame, text="Cancel", command=lambda: self.destroy())
         button.grid(row=0, column=1, sticky="ew")
 
@@ -104,25 +98,25 @@ class HooksDialog(Dialog):
         self.top.rowconfigure(0, weight=1)
 
         self.listbox = tk.Listbox(self.top)
-        self.listbox.grid(row=0, sticky="nsew")
+        self.listbox.grid(sticky="nsew", pady=PAD)
         self.listbox.bind("<<ListboxSelect>>", self.select)
         for hook_file in self.app.core.hooks:
             self.listbox.insert(tk.END, hook_file)
 
         frame = ttk.Frame(self.top)
-        frame.grid(row=1, sticky="ew")
+        frame.grid(sticky="ew")
         for i in range(4):
             frame.columnconfigure(i, weight=1)
         button = ttk.Button(frame, text="Create", command=self.click_create)
-        button.grid(row=0, column=0, sticky="ew")
+        button.grid(row=0, column=0, sticky="ew", padx=PAD)
         self.edit_button = ttk.Button(
             frame, text="Edit", state=tk.DISABLED, command=self.click_edit
         )
-        self.edit_button.grid(row=0, column=1, sticky="ew")
+        self.edit_button.grid(row=0, column=1, sticky="ew", padx=PAD)
         self.delete_button = ttk.Button(
             frame, text="Delete", state=tk.DISABLED, command=self.click_delete
         )
-        self.delete_button.grid(row=0, column=2, sticky="ew")
+        self.delete_button.grid(row=0, column=2, sticky="ew", padx=PAD)
         button = ttk.Button(frame, text="Cancel", command=lambda: self.destroy())
         button.grid(row=0, column=3, sticky="ew")
 
diff --git a/coretk/coretk/dialogs/icondialog.py b/coretk/coretk/dialogs/icondialog.py
index 98a4ed55..9273a177 100644
--- a/coretk/coretk/dialogs/icondialog.py
+++ b/coretk/coretk/dialogs/icondialog.py
@@ -6,6 +6,8 @@ from coretk.appconfig import ICONS_PATH
 from coretk.dialogs.dialog import Dialog
 from coretk.images import Images
 
+PAD = 5
+
 
 class IconDialog(Dialog):
     def __init__(self, master, app, name, image):
@@ -20,27 +22,30 @@ class IconDialog(Dialog):
 
         # row one
         frame = ttk.Frame(self.top)
-        frame.grid(row=0, column=0, pady=2, sticky="ew")
+        frame.grid(pady=PAD, sticky="ew")
         frame.columnconfigure(0, weight=1)
         frame.columnconfigure(1, weight=3)
         label = ttk.Label(frame, text="Image")
-        label.grid(row=0, column=0, sticky="ew")
+        label.grid(row=0, column=0, sticky="ew", padx=PAD)
         entry = ttk.Entry(frame, textvariable=self.file_path)
-        entry.grid(row=0, column=1, sticky="ew")
+        entry.grid(row=0, column=1, sticky="ew", padx=PAD)
         button = ttk.Button(frame, text="...", command=self.click_file)
         button.grid(row=0, column=2)
 
         # row two
         self.image_label = ttk.Label(self.top, image=self.image, anchor=tk.CENTER)
-        self.image_label.grid(row=1, column=0, pady=2, sticky="ew")
+        self.image_label.grid(pady=PAD, sticky="ew")
+
+        # spacer
+        self.draw_spacer()
 
         # row three
         frame = ttk.Frame(self.top)
-        frame.grid(row=2, column=0, sticky="ew")
+        frame.grid(sticky="ew")
         frame.columnconfigure(0, weight=1)
         frame.columnconfigure(1, weight=1)
         button = ttk.Button(frame, text="Apply", command=self.destroy)
-        button.grid(row=0, column=0, sticky="ew")
+        button.grid(row=0, column=0, sticky="ew", padx=PAD)
 
         button = ttk.Button(frame, text="Cancel", command=self.click_cancel)
         button.grid(row=0, column=1, sticky="ew")
diff --git a/coretk/coretk/dialogs/mobilityconfig.py b/coretk/coretk/dialogs/mobilityconfig.py
index 4e9d9590..007209dd 100644
--- a/coretk/coretk/dialogs/mobilityconfig.py
+++ b/coretk/coretk/dialogs/mobilityconfig.py
@@ -32,7 +32,8 @@ class MobilityConfigDialog(Dialog):
 
     def draw(self):
         self.top.columnconfigure(0, weight=1)
-        self.config_frame = ConfigFrame(self.top, self.app, self.config, borderwidth=0)
+        self.top.rowconfigure(0, weight=1)
+        self.config_frame = ConfigFrame(self.top, self.app, self.config)
         self.config_frame.draw_config()
         self.config_frame.grid(sticky="nsew", pady=PAD)
         self.draw_apply_buttons()
diff --git a/coretk/coretk/dialogs/mobilityplayer.py b/coretk/coretk/dialogs/mobilityplayer.py
index 63698644..1e7b4dc1 100644
--- a/coretk/coretk/dialogs/mobilityplayer.py
+++ b/coretk/coretk/dialogs/mobilityplayer.py
@@ -61,6 +61,7 @@ class MobilityPlayerDialog(Dialog):
         super().__init__(
             master, app, f"{canvas_node.core_node.name} Mobility Player", modal=False
         )
+        self.resizable(False, False)
         self.geometry("")
         self.canvas_node = canvas_node
         self.node = canvas_node.core_node
diff --git a/coretk/coretk/dialogs/nodeconfig.py b/coretk/coretk/dialogs/nodeconfig.py
index 8853e908..619c5ee7 100644
--- a/coretk/coretk/dialogs/nodeconfig.py
+++ b/coretk/coretk/dialogs/nodeconfig.py
@@ -66,6 +66,19 @@ class NodeConfigDialog(Dialog):
         frame.grid(sticky="ew")
         frame.columnconfigure(1, weight=1)
 
+        # icon field
+        label = ttk.Label(frame, text="Icon")
+        label.grid(row=row, column=0, sticky="ew", padx=PAD, pady=PAD)
+        self.image_button = ttk.Button(
+            frame,
+            text="Icon",
+            image=self.image,
+            compound=tk.NONE,
+            command=self.click_icon,
+        )
+        self.image_button.grid(row=row, column=1, sticky="ew")
+        row += 1
+
         # name field
         label = ttk.Label(frame, text="Name")
         label.grid(row=row, column=0, sticky="ew", padx=PAD, pady=PAD)
@@ -81,19 +94,6 @@ class NodeConfigDialog(Dialog):
         entry.grid(row=row, column=1, sticky="ew")
         row += 1
 
-        # icon field
-        label = ttk.Label(frame, text="Icon")
-        label.grid(row=row, column=0, sticky="ew", padx=PAD, pady=PAD)
-        self.image_button = ttk.Button(
-            frame,
-            text="Icon",
-            image=self.image,
-            compound=tk.NONE,
-            command=self.click_icon,
-        )
-        self.image_button.grid(row=row, column=1, sticky="ew")
-        row += 1
-
         # node type field
         if NodeUtils.is_model_node(self.node.type):
             label = ttk.Label(frame, text="Type")
@@ -137,6 +137,7 @@ class NodeConfigDialog(Dialog):
         if self.canvas_node.interfaces:
             self.draw_interfaces()
 
+        self.draw_spacer()
         self.draw_buttons()
 
     def draw_interfaces(self):
diff --git a/coretk/coretk/dialogs/nodeservice.py b/coretk/coretk/dialogs/nodeservice.py
index d950371b..dfcef922 100644
--- a/coretk/coretk/dialogs/nodeservice.py
+++ b/coretk/coretk/dialogs/nodeservice.py
@@ -8,6 +8,8 @@ from coretk.dialogs.dialog import Dialog
 from coretk.dialogs.serviceconfiguration import ServiceConfiguration
 from coretk.widgets import CheckboxList, ListboxScroll
 
+PAD = 5
+
 
 class NodeService(Dialog):
     def __init__(self, master, app, canvas_node, services=None):
@@ -38,7 +40,7 @@ class NodeService(Dialog):
         frame.rowconfigure(0, weight=1)
         for i in range(3):
             frame.columnconfigure(i, weight=1)
-        self.groups = ListboxScroll(frame, text="Groups")
+        self.groups = ListboxScroll(frame, text="Groups", padding=PAD)
         self.groups.grid(row=0, column=0, sticky="nsew")
         for group in sorted(self.app.core.services):
             self.groups.listbox.insert(tk.END, group)
@@ -46,11 +48,11 @@ class NodeService(Dialog):
         self.groups.listbox.selection_set(0)
 
         self.services = CheckboxList(
-            frame, self.app, text="Services", clicked=self.service_clicked
+            frame, self.app, text="Services", clicked=self.service_clicked, padding=PAD
         )
         self.services.grid(row=0, column=1, sticky="nsew")
 
-        self.current = ListboxScroll(frame, text="Selected")
+        self.current = ListboxScroll(frame, text="Selected", padding=PAD)
         self.current.grid(row=0, column=2, sticky="nsew")
         for service in sorted(self.current_services):
             self.current.listbox.insert(tk.END, service)
@@ -60,9 +62,9 @@ class NodeService(Dialog):
         for i in range(3):
             frame.columnconfigure(i, weight=1)
         button = ttk.Button(frame, text="Configure", command=self.click_configure)
-        button.grid(row=0, column=0, sticky="ew")
+        button.grid(row=0, column=0, sticky="ew", padx=PAD)
         button = ttk.Button(frame, text="Save", command=self.click_save)
-        button.grid(row=0, column=1, sticky="ew")
+        button.grid(row=0, column=1, sticky="ew", padx=PAD)
         button = ttk.Button(frame, text="Cancel", command=self.click_cancel)
         button.grid(row=0, column=2, sticky="ew")
 
diff --git a/coretk/coretk/dialogs/observers.py b/coretk/coretk/dialogs/observers.py
index 58499bd7..525939e0 100644
--- a/coretk/coretk/dialogs/observers.py
+++ b/coretk/coretk/dialogs/observers.py
@@ -4,6 +4,8 @@ from tkinter import ttk
 from coretk.coreclient import Observer
 from coretk.dialogs.dialog import Dialog
 
+PAD = 5
+
 
 class ObserverDialog(Dialog):
     def __init__(self, master, app):
@@ -27,7 +29,7 @@ class ObserverDialog(Dialog):
 
     def draw_listbox(self):
         frame = ttk.Frame(self.top)
-        frame.grid(sticky="nsew")
+        frame.grid(sticky="nsew", pady=PAD)
         frame.columnconfigure(0, weight=1)
         frame.rowconfigure(0, weight=1)
 
@@ -46,22 +48,22 @@ class ObserverDialog(Dialog):
 
     def draw_form_fields(self):
         frame = ttk.Frame(self.top)
-        frame.grid(sticky="ew")
+        frame.grid(sticky="ew", pady=PAD)
         frame.columnconfigure(1, weight=1)
 
         label = ttk.Label(frame, text="Name")
-        label.grid(row=0, column=0, sticky="w")
+        label.grid(row=0, column=0, sticky="w", padx=PAD)
         entry = ttk.Entry(frame, textvariable=self.name)
         entry.grid(row=0, column=1, sticky="ew")
 
         label = ttk.Label(frame, text="Command")
-        label.grid(row=1, column=0, sticky="w")
+        label.grid(row=1, column=0, sticky="w", padx=PAD)
         entry = ttk.Entry(frame, textvariable=self.cmd)
         entry.grid(row=1, column=1, sticky="ew")
 
     def draw_config_buttons(self):
         frame = ttk.Frame(self.top)
-        frame.grid(pady=2, sticky="ew")
+        frame.grid(sticky="ew", pady=PAD)
         for i in range(3):
             frame.columnconfigure(i, weight=1)
 
diff --git a/coretk/coretk/dialogs/preferences.py b/coretk/coretk/dialogs/preferences.py
index 7298f727..b094eec6 100644
--- a/coretk/coretk/dialogs/preferences.py
+++ b/coretk/coretk/dialogs/preferences.py
@@ -5,6 +5,8 @@ from tkinter import ttk
 from coretk import appconfig
 from coretk.dialogs.dialog import Dialog
 
+PAD = 5
+
 
 class PreferencesDialog(Dialog):
     def __init__(self, master, app):
@@ -18,16 +20,17 @@ class PreferencesDialog(Dialog):
 
     def draw(self):
         self.top.columnconfigure(0, weight=1)
+        self.top.rowconfigure(0, weight=1)
         self.draw_preferences()
         self.draw_buttons()
 
     def draw_preferences(self):
-        frame = ttk.LabelFrame(self.top, text="Preferences")
-        frame.grid(sticky="ew", pady=2)
+        frame = ttk.LabelFrame(self.top, text="Preferences", padding=PAD)
+        frame.grid(sticky="nsew", pady=2)
         frame.columnconfigure(1, weight=1)
 
         label = ttk.Label(frame, text="Theme")
-        label.grid(row=0, column=0, pady=2, padx=2, sticky="w")
+        label.grid(row=0, column=0, pady=PAD, padx=PAD, sticky="w")
         themes = self.app.style.theme_names()
         combobox = ttk.Combobox(
             frame, textvariable=self.theme, values=themes, state="readonly"
@@ -37,14 +40,14 @@ class PreferencesDialog(Dialog):
         combobox.bind("<<ComboboxSelected>>", self.theme_change)
 
         label = ttk.Label(frame, text="Editor")
-        label.grid(row=1, column=0, pady=2, padx=2, sticky="w")
+        label.grid(row=1, column=0, pady=PAD, padx=PAD, sticky="w")
         combobox = ttk.Combobox(
             frame, textvariable=self.editor, values=appconfig.EDITORS, state="readonly"
         )
         combobox.grid(row=1, column=1, sticky="ew")
 
         label = ttk.Label(frame, text="Terminal")
-        label.grid(row=2, column=0, pady=2, padx=2, sticky="w")
+        label.grid(row=2, column=0, pady=PAD, padx=PAD, sticky="w")
         combobox = ttk.Combobox(
             frame,
             textvariable=self.terminal,
@@ -54,7 +57,7 @@ class PreferencesDialog(Dialog):
         combobox.grid(row=2, column=1, sticky="ew")
 
         label = ttk.Label(frame, text="3D GUI")
-        label.grid(row=3, column=0, pady=2, padx=2, sticky="w")
+        label.grid(row=3, column=0, pady=PAD, padx=PAD, sticky="w")
         entry = ttk.Entry(frame, textvariable=self.gui3d)
         entry.grid(row=3, column=1, sticky="ew")
 
diff --git a/coretk/coretk/dialogs/servers.py b/coretk/coretk/dialogs/servers.py
index 9df7bf55..18c5d6d1 100644
--- a/coretk/coretk/dialogs/servers.py
+++ b/coretk/coretk/dialogs/servers.py
@@ -4,6 +4,7 @@ from tkinter import ttk
 from coretk.coreclient import CoreServer
 from coretk.dialogs.dialog import Dialog
 
+PAD = 5
 DEFAULT_NAME = "example"
 DEFAULT_ADDRESS = "127.0.0.1"
 DEFAULT_PORT = 50051
@@ -26,13 +27,13 @@ class ServersDialog(Dialog):
         self.top.columnconfigure(0, weight=1)
         self.top.rowconfigure(0, weight=1)
         self.draw_servers()
-        self.draw_server_configuration()
         self.draw_servers_buttons()
+        self.draw_server_configuration()
         self.draw_apply_buttons()
 
     def draw_servers(self):
         frame = ttk.Frame(self.top)
-        frame.grid(pady=2, sticky="nsew")
+        frame.grid(pady=PAD, sticky="nsew")
         frame.columnconfigure(0, weight=1)
         frame.rowconfigure(0, weight=1)
 
@@ -51,27 +52,24 @@ class ServersDialog(Dialog):
         scrollbar.config(command=self.servers.yview)
 
     def draw_server_configuration(self):
-        label = ttk.Label(self.top, text="Server Configuration")
-        label.grid(pady=2, sticky="ew")
-
-        frame = ttk.Frame(self.top)
-        frame.grid(pady=2, sticky="ew")
+        frame = ttk.LabelFrame(self.top, text="Server Configuration", padding=PAD)
+        frame.grid(pady=PAD, sticky="ew")
         frame.columnconfigure(1, weight=1)
         frame.columnconfigure(3, weight=1)
         frame.columnconfigure(5, weight=1)
 
         label = ttk.Label(frame, text="Name")
-        label.grid(row=0, column=0, sticky="w")
+        label.grid(row=0, column=0, sticky="w", padx=PAD, pady=PAD)
         entry = ttk.Entry(frame, textvariable=self.name)
         entry.grid(row=0, column=1, sticky="ew")
 
         label = ttk.Label(frame, text="Address")
-        label.grid(row=0, column=2, sticky="w")
+        label.grid(row=0, column=2, sticky="w", padx=PAD, pady=PAD)
         entry = ttk.Entry(frame, textvariable=self.address)
         entry.grid(row=0, column=3, sticky="ew")
 
         label = ttk.Label(frame, text="Port")
-        label.grid(row=0, column=4, sticky="w")
+        label.grid(row=0, column=4, sticky="w", padx=PAD, pady=PAD)
         entry = ttk.Entry(
             frame,
             textvariable=self.port,
@@ -85,17 +83,17 @@ class ServersDialog(Dialog):
 
     def draw_servers_buttons(self):
         frame = ttk.Frame(self.top)
-        frame.grid(pady=2, sticky="ew")
+        frame.grid(pady=PAD, sticky="ew")
         for i in range(3):
             frame.columnconfigure(i, weight=1)
 
         button = ttk.Button(frame, text="Create", command=self.click_create)
-        button.grid(row=0, column=0, sticky="ew")
+        button.grid(row=0, column=0, sticky="ew", padx=PAD)
 
         self.save_button = ttk.Button(
             frame, text="Save", state=tk.DISABLED, command=self.click_save
         )
-        self.save_button.grid(row=0, column=1, sticky="ew")
+        self.save_button.grid(row=0, column=1, sticky="ew", padx=PAD)
 
         self.delete_button = ttk.Button(
             frame, text="Delete", state=tk.DISABLED, command=self.click_delete
@@ -111,7 +109,7 @@ class ServersDialog(Dialog):
         button = ttk.Button(
             frame, text="Save Configuration", command=self.click_save_configuration
         )
-        button.grid(row=0, column=0, sticky="ew")
+        button.grid(row=0, column=0, sticky="ew", padx=PAD)
 
         button = ttk.Button(frame, text="Cancel", command=self.destroy)
         button.grid(row=0, column=1, sticky="ew")
diff --git a/coretk/coretk/dialogs/sessions.py b/coretk/coretk/dialogs/sessions.py
index e3d9e696..f8d26667 100644
--- a/coretk/coretk/dialogs/sessions.py
+++ b/coretk/coretk/dialogs/sessions.py
@@ -10,6 +10,8 @@ from coretk.dialogs.dialog import Dialog
 from coretk.errors import show_grpc_error
 from coretk.images import ImageEnum, Images
 
+PAD = 5
+
 
 class SessionsDialog(Dialog):
     def __init__(self, master, app):
@@ -31,6 +33,7 @@ class SessionsDialog(Dialog):
 
     def draw(self):
         self.top.columnconfigure(0, weight=1)
+        self.top.rowconfigure(1, weight=1)
         self.draw_description()
         self.draw_tree()
         self.draw_buttons()
@@ -46,14 +49,19 @@ class SessionsDialog(Dialog):
             "connect to an existing session. Usually, only sessions in \n"
             "the RUNTIME state persist in the daemon, except for the \n"
             "one you might be concurrently editting.",
+            justify=tk.CENTER,
         )
-        label.grid(row=0, sticky="ew", pady=5)
+        label.grid(pady=PAD)
 
     def draw_tree(self):
+        frame = ttk.Frame(self.top)
+        frame.columnconfigure(0, weight=1)
+        frame.rowconfigure(0, weight=1)
+        frame.grid(sticky="nsew")
         self.tree = ttk.Treeview(
-            self.top, columns=("id", "state", "nodes"), show="headings"
+            frame, columns=("id", "state", "nodes"), show="headings"
         )
-        self.tree.grid(row=1, sticky="nsew")
+        self.tree.grid(sticky="nsew")
         self.tree.column("id", stretch=tk.YES)
         self.tree.heading("id", text="ID")
         self.tree.column("state", stretch=tk.YES)
@@ -72,21 +80,19 @@ class SessionsDialog(Dialog):
         self.tree.bind("<Double-1>", self.on_selected)
         self.tree.bind("<<TreeviewSelect>>", self.click_select)
 
-        yscrollbar = ttk.Scrollbar(self.top, orient="vertical", command=self.tree.yview)
-        yscrollbar.grid(row=1, column=1, sticky="ns")
+        yscrollbar = ttk.Scrollbar(frame, orient="vertical", command=self.tree.yview)
+        yscrollbar.grid(row=0, column=1, sticky="ns")
         self.tree.configure(yscrollcommand=yscrollbar.set)
 
-        xscrollbar = ttk.Scrollbar(
-            self.top, orient="horizontal", command=self.tree.xview
-        )
-        xscrollbar.grid(row=2, sticky="ew", pady=5)
+        xscrollbar = ttk.Scrollbar(frame, orient="horizontal", command=self.tree.xview)
+        xscrollbar.grid(row=1, sticky="ew", pady=5)
         self.tree.configure(xscrollcommand=xscrollbar.set)
 
     def draw_buttons(self):
         frame = ttk.Frame(self.top)
         for i in range(4):
             frame.columnconfigure(i, weight=1)
-        frame.grid(row=3, sticky="ew")
+        frame.grid(sticky="ew")
 
         image = Images.get(ImageEnum.DOCUMENTNEW, 16)
         b = ttk.Button(
diff --git a/coretk/coretk/dialogs/shapemod.py b/coretk/coretk/dialogs/shapemod.py
index e0085a8c..63037c9d 100644
--- a/coretk/coretk/dialogs/shapemod.py
+++ b/coretk/coretk/dialogs/shapemod.py
@@ -8,6 +8,8 @@ from coretk.dialogs.dialog import Dialog
 from coretk.graph import tags
 from coretk.graph.shapeutils import is_draw_shape, is_shape_text
 
+PADX = (0, 5)
+PAD = 5
 FONT_SIZES = [8, 9, 10, 11, 12, 14, 16, 18, 20, 22, 24, 26, 28, 36, 48, 72]
 BORDER_WIDTH = [0, 1, 2, 3, 4, 5, 6, 7, 8, 9, 10]
 
@@ -37,20 +39,27 @@ class ShapeDialog(Dialog):
         self.bold = tk.BooleanVar(value=data.bold)
         self.italic = tk.BooleanVar(value=data.italic)
         self.underline = tk.BooleanVar(value=data.underline)
-        self.top.columnconfigure(0, weight=1)
         self.draw()
 
     def draw(self):
-        frame = ttk.Frame(self.top)
-        frame.columnconfigure(0, weight=1)
-        frame.columnconfigure(1, weight=2)
-        label = ttk.Label(frame, text="Text for top of shape: ")
-        label.grid(row=0, column=0, sticky="nsew")
-        entry = ttk.Entry(frame, textvariable=self.shape_text)
-        entry.grid(row=0, column=1, sticky="nsew")
-        frame.grid(row=0, column=0, sticky="nsew", padx=3, pady=3)
+        self.top.columnconfigure(0, weight=1)
+        self.draw_label_options()
+        if is_draw_shape(self.shape.shape_type):
+            self.draw_shape_options()
+        self.draw_spacer()
+        self.draw_buttons()
 
-        frame = ttk.Frame(self.top)
+    def draw_label_options(self):
+        label_frame = ttk.LabelFrame(self.top, text="Label", padding=PAD)
+        label_frame.grid(sticky="ew")
+        label_frame.columnconfigure(0, weight=1)
+
+        entry = ttk.Entry(label_frame, textvariable=self.shape_text)
+        entry.grid(sticky="ew", pady=PAD)
+
+        # font options
+        frame = ttk.Frame(label_frame)
+        frame.grid(sticky="nsew", padx=3, pady=3)
         frame.columnconfigure(0, weight=1)
         frame.columnconfigure(1, weight=1)
         frame.columnconfigure(2, weight=1)
@@ -65,70 +74,65 @@ class ShapeDialog(Dialog):
             frame, textvariable=self.font_size, values=FONT_SIZES, state="readonly"
         )
         combobox.grid(row=0, column=1, padx=3, sticky="nsew")
-        button = ttk.Button(frame, text="Text color", command=self.choose_text_color)
+        button = ttk.Button(frame, text="Color", command=self.choose_text_color)
         button.grid(row=0, column=2, sticky="nsew")
-        frame.grid(row=1, column=0, sticky="nsew", padx=3, pady=3)
 
-        frame = ttk.Frame(self.top)
+        # style options
+        frame = ttk.Frame(label_frame)
+        frame.grid(sticky="ew")
+        for i in range(3):
+            frame.columnconfigure(i, weight=1)
         button = ttk.Checkbutton(frame, variable=self.bold, text="Bold")
-        button.grid(row=0, column=0)
+        button.grid(row=0, column=0, sticky="ew")
         button = ttk.Checkbutton(frame, variable=self.italic, text="Italic")
-        button.grid(row=0, column=1, padx=3)
+        button.grid(row=0, column=1, padx=3, sticky="ew")
         button = ttk.Checkbutton(frame, variable=self.underline, text="Underline")
-        button.grid(row=0, column=2)
-        frame.grid(row=2, column=0, sticky="nsew", padx=3, pady=3)
+        button.grid(row=0, column=2, sticky="ew")
 
-        if is_draw_shape(self.shape.shape_type):
-            frame = ttk.Frame(self.top)
-            frame.columnconfigure(0, weight=1)
-            frame.columnconfigure(1, weight=1)
-            frame.columnconfigure(2, weight=1)
-            label = ttk.Label(frame, text="Fill color")
-            label.grid(row=0, column=0, sticky="nsew")
-            self.fill = ttk.Label(
-                frame, text=self.fill_color, background=self.fill_color
-            )
-            self.fill.grid(row=0, column=1, sticky="nsew", padx=3)
-            button = ttk.Button(frame, text="Color", command=self.choose_fill_color)
-            button.grid(row=0, column=2, sticky="nsew")
-            frame.grid(row=3, column=0, sticky="nsew", padx=3, pady=3)
+    def draw_shape_options(self):
+        label_frame = ttk.LabelFrame(self.top, text="Shape", padding=PAD)
+        label_frame.grid(sticky="ew", pady=PAD)
+        label_frame.columnconfigure(0, weight=1)
 
-            frame = ttk.Frame(self.top)
-            frame.columnconfigure(0, weight=1)
-            frame.columnconfigure(1, weight=1)
-            frame.columnconfigure(2, weight=1)
-            label = ttk.Label(frame, text="Border color:")
-            label.grid(row=0, column=0, sticky="nsew")
-            self.border = ttk.Label(
-                frame, text=self.border_color, background=self.fill_color
-            )
-            self.border.grid(row=0, column=1, sticky="nsew", padx=3)
-            button = ttk.Button(frame, text="Color", command=self.choose_border_color)
-            button.grid(row=0, column=2, sticky="nsew")
-            frame.grid(row=4, column=0, sticky="nsew", padx=3, pady=3)
+        frame = ttk.Frame(label_frame)
+        frame.grid(sticky="ew")
+        for i in range(1, 3):
+            frame.columnconfigure(i, weight=1)
+        label = ttk.Label(frame, text="Fill Color")
+        label.grid(row=0, column=0, padx=PADX, sticky="w")
+        self.fill = ttk.Label(frame, text=self.fill_color, background=self.fill_color)
+        self.fill.grid(row=0, column=1, sticky="ew", padx=PADX)
+        button = ttk.Button(frame, text="Color", command=self.choose_fill_color)
+        button.grid(row=0, column=2, sticky="ew")
 
-            frame = ttk.Frame(self.top)
-            frame.columnconfigure(0, weight=1)
-            frame.columnconfigure(1, weight=2)
-            label = ttk.Label(frame, text="Border width:")
-            label.grid(row=0, column=0, sticky="nsew")
-            combobox = ttk.Combobox(
-                frame,
-                textvariable=self.border_width,
-                values=BORDER_WIDTH,
-                state="readonly",
-            )
-            combobox.grid(row=0, column=1, sticky="nsew")
-            frame.grid(row=5, column=0, sticky="nsew", padx=3, pady=3)
+        label = ttk.Label(frame, text="Border Color")
+        label.grid(row=1, column=0, sticky="w", padx=PADX)
+        self.border = ttk.Label(
+            frame, text=self.border_color, background=self.border_color
+        )
+        self.border.grid(row=1, column=1, sticky="ew", padx=PADX)
+        button = ttk.Button(frame, text="Color", command=self.choose_border_color)
+        button.grid(row=1, column=2, sticky="ew")
 
+        frame = ttk.Frame(label_frame)
+        frame.grid(sticky="ew", pady=PAD)
+        frame.columnconfigure(1, weight=1)
+        label = ttk.Label(frame, text="Border Width")
+        label.grid(row=0, column=0, sticky="w", padx=PADX)
+        combobox = ttk.Combobox(
+            frame, textvariable=self.border_width, values=BORDER_WIDTH, state="readonly"
+        )
+        combobox.grid(row=0, column=1, sticky="nsew")
+
+    def draw_buttons(self):
         frame = ttk.Frame(self.top)
+        frame.grid(sticky="nsew")
         frame.columnconfigure(0, weight=1)
         frame.columnconfigure(1, weight=1)
         button = ttk.Button(frame, text="Add shape", command=self.click_add)
-        button.grid(row=0, column=0, sticky="e", padx=3)
+        button.grid(row=0, column=0, sticky="ew", padx=PADX)
         button = ttk.Button(frame, text="Cancel", command=self.cancel)
-        button.grid(row=0, column=1, sticky="w", pady=3)
-        frame.grid(row=6, column=0, sticky="nsew", padx=3, pady=3)
+        button.grid(row=0, column=1, sticky="ew")
 
     def choose_text_color(self):
         color = colorchooser.askcolor(color="black")
@@ -140,7 +144,7 @@ class ShapeDialog(Dialog):
         self.fill.config(background=color[1], text=color[1])
 
     def choose_border_color(self):
-        color = colorchooser.askcolor(color="black")
+        color = colorchooser.askcolor(color=self.border_color)
         self.border_color = color[1]
         self.border.config(background=color[1], text=color[1])
 
diff --git a/coretk/coretk/dialogs/wlanconfig.py b/coretk/coretk/dialogs/wlanconfig.py
index 42adc49a..711f94f0 100644
--- a/coretk/coretk/dialogs/wlanconfig.py
+++ b/coretk/coretk/dialogs/wlanconfig.py
@@ -30,7 +30,8 @@ class WlanConfigDialog(Dialog):
 
     def draw(self):
         self.top.columnconfigure(0, weight=1)
-        self.config_frame = ConfigFrame(self.top, self.app, self.config, borderwidth=0)
+        self.top.rowconfigure(0, weight=1)
+        self.config_frame = ConfigFrame(self.top, self.app, self.config)
         self.config_frame.draw_config()
         self.config_frame.grid(sticky="nsew", pady=PAD)
         self.draw_apply_buttons()
diff --git a/coretk/coretk/graph/node.py b/coretk/coretk/graph/node.py
index 5757f081..ef4686be 100644
--- a/coretk/coretk/graph/node.py
+++ b/coretk/coretk/graph/node.py
@@ -4,6 +4,7 @@ from tkinter import font
 import grpc
 
 from core.api.grpc.core_pb2 import NodeType
+from coretk import themes
 from coretk.dialogs.emaneconfig import EmaneConfigDialog
 from coretk.dialogs.mobilityconfig import MobilityConfigDialog
 from coretk.dialogs.nodeconfig import NodeConfigDialog
@@ -161,6 +162,7 @@ class CanvasNode:
         is_wlan = self.core_node.type == NodeType.WIRELESS_LAN
         is_emane = self.core_node.type == NodeType.EMANE
         context = tk.Menu(self.canvas)
+        themes.update_menu(self.app.style, context)
         if self.app.core.is_runtime():
             context.add_command(label="Configure", command=self.show_config)
             if NodeUtils.is_container_node(self.core_node.type):
diff --git a/coretk/coretk/menuaction.py b/coretk/coretk/menuaction.py
index a9f9ca34..3115cd58 100644
--- a/coretk/coretk/menuaction.py
+++ b/coretk/coretk/menuaction.py
@@ -12,8 +12,8 @@ import grpc
 
 from coretk.appconfig import XML_PATH
 from coretk.dialogs.about import AboutDialog
-from coretk.dialogs.canvasbackground import CanvasBackgroundDialog
 from coretk.dialogs.canvassizeandscale import SizeAndScaleDialog
+from coretk.dialogs.canvaswallpaper import CanvasBackgroundDialog
 from coretk.dialogs.hooks import HooksDialog
 from coretk.dialogs.observers import ObserverDialog
 from coretk.dialogs.preferences import PreferencesDialog
diff --git a/coretk/coretk/menubar.py b/coretk/coretk/menubar.py
index ed5cb2ca..2521bd97 100644
--- a/coretk/coretk/menubar.py
+++ b/coretk/coretk/menubar.py
@@ -80,6 +80,7 @@ class Menubar(tk.Menu):
         :return: nothing
         """
         menu = tk.Menu(self)
+        menu.add_command(label="Preferences", command=self.menuaction.gui_preferences)
         menu.add_command(label="Undo", accelerator="Ctrl+Z", state=tk.DISABLED)
         menu.add_command(label="Redo", accelerator="Ctrl+Y", state=tk.DISABLED)
         menu.add_separator()
@@ -94,9 +95,6 @@ class Menubar(tk.Menu):
         menu.add_separator()
         menu.add_command(label="Find...", accelerator="Ctrl+F", state=tk.DISABLED)
         menu.add_command(label="Clear marker", state=tk.DISABLED)
-        menu.add_command(
-            label="Preferences...", command=self.menuaction.gui_preferences
-        )
         self.add_cascade(label="Edit", menu=menu)
 
     def draw_canvas_menu(self):
@@ -436,16 +434,14 @@ class Menubar(tk.Menu):
         """
         menu = tk.Menu(self)
         menu.add_command(
-            label="Change sessions...",
-            command=self.menuaction.session_change_sessions,
-            underline=0,
+            label="Sessions...", command=self.menuaction.session_change_sessions
         )
         menu.add_separator()
-        menu.add_command(label="Comments...", state=tk.DISABLED)
-        menu.add_command(label="Hooks...", command=self.menuaction.session_hooks)
-        menu.add_command(label="Reset node positions", state=tk.DISABLED)
-        menu.add_command(label="Servers...", command=self.menuaction.session_servers)
         menu.add_command(label="Options...", command=self.menuaction.session_options)
+        menu.add_command(label="Servers...", command=self.menuaction.session_servers)
+        menu.add_command(label="Hooks...", command=self.menuaction.session_hooks)
+        menu.add_command(label="Reset Nodes", state=tk.DISABLED)
+        menu.add_command(label="Comments...", state=tk.DISABLED)
         self.add_cascade(label="Session", menu=menu)
 
     def draw_help_menu(self):
diff --git a/coretk/coretk/themes.py b/coretk/coretk/themes.py
index a1982b3e..a870b278 100644
--- a/coretk/coretk/themes.py
+++ b/coretk/coretk/themes.py
@@ -140,15 +140,19 @@ def update_bg(style, event):
     event.widget.config(background=bg)
 
 
-def update_menu(style, event):
+def theme_change_menu(style, event):
     if not isinstance(event.widget, tk.Menu):
         return
+    update_menu(style, event.widget)
+
+
+def update_menu(style, widget):
     bg = style.lookup(".", "background")
     fg = style.lookup(".", "foreground")
     abg = style.lookup(".", "lightcolor")
     if not abg:
         abg = bg
-    event.widget.config(
+    widget.config(
         background=bg, foreground=fg, activebackground=abg, activeforeground=fg
     )
 
diff --git a/coretk/coretk/widgets.py b/coretk/coretk/widgets.py
index fb5582a1..e3fd5c35 100644
--- a/coretk/coretk/widgets.py
+++ b/coretk/coretk/widgets.py
@@ -65,7 +65,7 @@ class FrameScroll(ttk.LabelFrame):
 
 class ConfigFrame(FrameScroll):
     def __init__(self, master, app, config, **kw):
-        super().__init__(master, app, ttk.Notebook, **kw)
+        super().__init__(master, app, ttk.Notebook, borderwidth=0, **kw)
         self.app = app
         self.config = config
         self.values = {}