flex动态添加button并添加click事件

<?xml version="1.0" encoding="utf-8"?><s:Application xmlns:fx="http://ns.adobe.com/mxml/2009"    xmlns:s="library://ns.adobe.com/flex/spark"    xmlns:mx="library://ns.adobe.com/flex/mx" minWidth="955" minHeight="600"><fx:Script><![CDATA[import mx.collections.ArrayCollection;import mx.controls.Alert;private var array:ArrayCollection = new ArrayCollection();private function addButtons():void{for(var i:int=0;i<10;i++) {var btn:Button = new Button();btn.label = "123";btn.id = "btn"+i.toString();btn.label = "btn"+i.toString();btn.x = 10+i*80;btn.y = 50;btn.alpha = 0.1;btn.addEventListener(MouseEvent.CLICK,handleClick);btn.addEventListener(MouseEvent.MOUSE_OVER,handleOver);btns.addElement(btn);}}private function handleClick(event:Event):void {var b:Button = event.target as Button;Alert.show("button的ID："+b.id.toString());}private function handleOver(event:Event):void {var b:Button = event.target as Button;Alert.show("button的x坐标："+b.x.toString());b.alpha = 1.0;}]]></fx:Script><fx:Declarations><!-- 将非可视元素（例如服务、值对象）放在此处 --></fx:Declarations><s:Button x="471" y="88" label="test" click="addButtons()"/><s:Panel id="btns" x="35" y="148" width="834" height="243"></s:Panel></s:Application>