adding event listener vbox demo

03b-event-listeners/VBoxDemo.mxml

@@ -0,0 +1,62 @@
+<?xml version="1.0" encoding="utf-8"?>
+<mx:Application xmlns:mx="http://www.adobe.com/2006/mxml"
+    name="DemoApplication"
+    backgroundColor="#FFFFFF"
+    backgroundAlpha="0"
+    creationComplete="initApp()"
+    >
+
+    <mx:Script>
+        <![CDATA[
+            import flash.events.EventPhase
+            import mx.controls.Alert;
+
+            private function initApp():void {
+                myVBox2.addEventListener("click", myHandleClick);
+                myVBox3.addEventListener("click", myHandleClick2);
+            }
+
+            private function myHandleClick(event:Event):void {
+                label1.text = "You clicked VBox 2";
+            }
+
+            private function myHandleClick2(event:Event):void {
+                myVBox2.removeEventListener("click",myHandleClick);
+                label1.text = "";
+            }
+
+       ]]>
+    </mx:Script>
+    <mx:Label text="Application"/>
+
+    <mx:VBox id="myVBox1"
+        backgroundColor="#FFCCFF"
+        width="300" height="100"
+        horizontalAlign="center">
+
+        <mx:Label text="VBox 1" />
+
+    </mx:VBox>
+
+    <mx:VBox id="myVBox2"
+        backgroundColor="#FFCCCC"
+        width="300" height="100"
+        horizontalAlign="center">
+
+    <mx:Label text="VBox 2" />
+
+    </mx:VBox>
+
+    <mx:VBox id="myVBox3"
+        backgroundColor="#FFFFCC"
+        width="300" height="100"
+        horizontalAlign="center">
+
+        <mx:Label text="VBox 3" />
+
+    </mx:VBox>
+    <mx:Label id="label1"
+        width="80%" height="48"
+        fontWeight="bold" />
+
+</mx:Application>