diff --git a/coretk/coretk/app.py b/coretk/coretk/app.py
index 68060927..f0445257 100644
--- a/coretk/coretk/app.py
+++ b/coretk/coretk/app.py
@@ -10,6 +10,7 @@ from coretk.images import ImageEnum, Images
 from coretk.menuaction import MenuAction
 from coretk.menubar import Menubar
 from coretk.nodeutils import NodeUtils
+from coretk.status import StatusBar
 from coretk.toolbar import Toolbar
 
 
@@ -80,7 +81,7 @@ class Application(tk.Frame):
         self.canvas.configure(yscrollcommand=scroll_y.set)
 
     def draw_status(self):
-        self.statusbar = ttk.Frame(self)
+        self.statusbar = StatusBar(master=self, app=self)
         self.statusbar.pack(side=tk.BOTTOM, fill=tk.X)
 
     def on_closing(self):
diff --git a/coretk/coretk/graph.py b/coretk/coretk/graph.py
index ca4b0001..df660c7f 100644
--- a/coretk/coretk/graph.py
+++ b/coretk/coretk/graph.py
@@ -350,10 +350,7 @@ class CanvasGraph(tk.Canvas):
         :param event:
         :return:
         """
-        # delete canvas data
         nodes = self.canvas_management.delete_selected_nodes()
-
-        # delete core data
         self.core.delete_graph_nodes(nodes)
 
     def add_node(self, x, y):
diff --git a/coretk/coretk/graph_helper.py b/coretk/coretk/graph_helper.py
index e691667b..1ad0c8f6 100644
--- a/coretk/coretk/graph_helper.py
+++ b/coretk/coretk/graph_helper.py
@@ -88,18 +88,41 @@ class WlanAntennaManager:
         """
         if self.quantity < 5:
             x, y = self.canvas.coords(self.node_id)
-            self.antennas.append(
-                self.canvas.create_image(
-                    x - 16 + self.offset,
-                    y - 16,
-                    anchor=tk.CENTER,
-                    image=self.image,
-                    tags="antenna",
-                )
+            aid = self.canvas.create_image(
+                x - 16 + self.offset,
+                y - 23,
+                anchor=tk.CENTER,
+                image=self.image,
+                tags="antenna",
             )
+            # self.canvas.tag_raise("antenna")
+            self.antennas.append(aid)
             self.quantity = self.quantity + 1
             self.offset = self.offset + 8
 
+    def delete_antenna(self):
+        """
+        delete one antenna
+
+        :return: nothing
+        """
+        if len(self.antennas) > 0:
+            self.canvas.delete(self.antennas.pop())
+        self.quantity -= 1
+        self.offset -= 8
+
+    def delete_antennas(self):
+        """
+        delete all antennas
+
+        :return: nothing
+        """
+        for aid in self.antennas:
+            self.canvas.delete(aid)
+        self.antennas.clear()
+        self.quantity = 0
+        self.offset = 0
+
     def update_antennas_position(self, offset_x, offset_y):
         """
         redraw antennas of a node according to the new node position
@@ -108,15 +131,3 @@ class WlanAntennaManager:
         """
         for i in self.antennas:
             self.canvas.move(i, offset_x, offset_y)
-
-    def delete_antenna(self, canvas_id):
-        return
-
-    def delete_antennas(self):
-        """
-        Delete all the antennas of a node
-
-        :return: nothing
-        """
-        for i in self.antennas:
-            self.canvas.delete(i)
diff --git a/coretk/coretk/nodedelete.py b/coretk/coretk/nodedelete.py
index 165fde53..27e330b5 100644
--- a/coretk/coretk/nodedelete.py
+++ b/coretk/coretk/nodedelete.py
@@ -1,6 +1,7 @@
 """
 manage deletion
 """
+from core.api.grpc import core_pb2
 
 
 class CanvasComponentManagement:
@@ -41,6 +42,24 @@ class CanvasComponentManagement:
     def delete_selected_nodes(self):
         edges = set()
         nodes = []
+        for cnid in self.selected:
+            canvas_node = self.canvas.nodes[cnid]
+            if canvas_node.core_node.type != core_pb2.NodeType.WIRELESS_LAN:
+                canvas_node.antenna_draw.delete_antennas()
+            else:
+                for e in canvas_node.edges:
+                    link_proto = self.app.links[e.token]
+                    node_one_id, node_two_id = (
+                        link_proto.node_one_id,
+                        link_proto.node_two_id,
+                    )
+                    if node_one_id == canvas_node.core_node.id:
+                        neighbor_id = node_two_id
+                    else:
+                        neighbor_id = node_one_id
+                    neighbor = self.app.canvas_nodes[neighbor_id]
+                    if neighbor.core_node.type != core_pb2.NodeType.WIRELESS_LAN:
+                        neighbor.antenna_draw.delete_antenna()
         for node_id in list(self.selected):
             bbox_id = self.selected[node_id]
             canvas_node = self.canvas.nodes.pop(node_id)
diff --git a/coretk/coretk/status.py b/coretk/coretk/status.py
new file mode 100644
index 00000000..69869f51
--- /dev/null
+++ b/coretk/coretk/status.py
@@ -0,0 +1,44 @@
+"status bar"
+import time
+import tkinter as tk
+from tkinter import ttk
+
+
+class StatusBar(ttk.Frame):
+    def __init__(self, master, app, **kwargs):
+        super().__init__(master, **kwargs)
+        self.app = app
+
+        self.status = None
+        self.statusvar = tk.StringVar()
+        self.zoom = None
+        self.cpu_usage = None
+        self.memory = None
+        self.emulation_light = None
+        self.running = False
+        self.draw()
+
+    def draw(self):
+        self.columnconfigure(0, weight=8)
+        self.columnconfigure(1, weight=1)
+        self.columnconfigure(2, weight=1)
+        self.columnconfigure(3, weight=1)
+        self.status = ttk.Label(self, textvariable=self.statusvar)
+        self.statusvar.set("status")
+        self.status.grid(row=0, column=0)
+        self.zoom = ttk.Label(self, text="zoom")
+        self.zoom.grid(row=0, column=1)
+        self.cpu_usage = ttk.Label(self, text="cpu usage")
+        self.cpu_usage.grid(row=0, column=2)
+        self.emulation_light = ttk.Label(self, text="emulation light")
+        self.emulation_light.grid(row=0, column=3)
+
+    def processing(self):
+        texts = ["Processing.", "Processing..", "Processing...", "Processing...."]
+        i = 0
+        while self.running:
+            self.statusvar.set(texts[i % 4])
+            self.master.update()
+            i = i + 1
+            time.sleep(0.002)
+        print("thread finish")
diff --git a/coretk/coretk/toolbar.py b/coretk/coretk/toolbar.py
index 834f7b39..1aae22c8 100644
--- a/coretk/coretk/toolbar.py
+++ b/coretk/coretk/toolbar.py
@@ -1,4 +1,5 @@
 import logging
+import time
 import tkinter as tk
 from functools import partial
 from tkinter import ttk
@@ -195,13 +196,25 @@ class Toolbar(ttk.Frame):
 
         :return: nothing
         """
-        logging.debug("clicked start button")
+        self.app.statusbar.running = True
+        # thread = threading.Thread(target=self.app.statusbar.processing)
+        # thread.start()
         self.master.config(cursor="watch")
         self.master.update()
         self.app.canvas.mode = GraphMode.SELECT
+        start = time.time()
         self.app.core.start_session()
+        dur = time.time() - start
         self.runtime_frame.tkraise()
         self.master.config(cursor="")
+        nodes_num = len(self.app.core.canvas_nodes)
+        links_num = len(self.app.core.links)
+        self.app.statusbar.statusvar.set(
+            "Network topology instantiated in %s seconds (%s node(s) and %s link(s))"
+            % ("%.3f" % dur, nodes_num, links_num)
+        )
+        # self.app.statusbar.running = False
+        # print("done")
 
     def click_link(self):
         logging.debug("Click LINK button")
@@ -355,7 +368,13 @@ class Toolbar(ttk.Frame):
         :return: nothing
         """
         logging.debug("Click on STOP button ")
+        # self.status_thread.join()
+        start = time.time()
         self.app.core.stop_session()
+        dur = time.time() - start
+        self.app.statusbar.statusvar.set(
+            "Cleanup completed in %s seconds" % "%.3f" % dur
+        )
         self.app.canvas.delete("wireless")
         self.design_frame.tkraise()