Flex 右键菜单

MXML:
<?xml version="1.0"?>
<mx:Application xmlns:mx="http://www.adobe.com/2006/mxml" fontSize="20" initialize="doinit()"   mouseOver="getMouseTarget(event)">
 <mx:ArrayCollection id="dgArray">
  <mx:Object pid="1" name="秦始皇" time="秦" />
  <mx:Object pid="2" name="汉高祖" time="汉" />
  <mx:Object pid="3" name="唐太宗" time="唐" />
 </mx:ArrayCollection>
 <mx:Style>
  .myTitle{
   fontSize: 12;
   fontWeight: bolt;
   fontFamily: 黑体;
  }
 </mx:Style>
    <mx:Script>
        <![CDATA[
         import mx.events.MenuEvent;
         import mx.events.FlexMouseEvent;
         import mx.controls.Menu;
         import mx.collections.ArrayCollection;
            import mx.controls.Alert;
     import events.EventDispatcherExample;
            [Bindable]
            private var dp:Array = [1, 2, 3, 4, 5, 6, 7, 8, 9]; 
   [Bindable]
   public var mouseTarget:DisplayObject;
            private function clickDouble(evt:MouseEvent):void{
             if(evt.target == null){
              return;
             }
             if(!evt.target.hasO