flex 动态chekbox

<?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"    creationComplete="startup(event)" ><fx:Declarations><!-- 将非可视元素（例如服务、值对象）放在此处 --></fx:Declarations><fx:Script><![CDATA[import mx.controls.Alert;import mx.controls.CheckBox;import mx.events.FlexEvent;//管理员已经分配的appids[Bindable]public var adminappids:Array;public var arr:Array=new Array();//初始化protected function startup(event:FlexEvent):void{arr.push("123","345","456");var check:CheckBox;for(var i:int=0;i<arr.length;i++){check=new CheckBox();check.id="c"+i;check.label=arr[i];check.selected =false;appids.addElement(check);}}protected function button1_clickHandler(event:MouseEvent):void{for(var i:int=0;i<arr.length;i++){var check:CheckBox=CheckBox(appids.getChildAt(i));Alert.show(""+check.selected,""+i);}}]]></fx:Script><fx:Declarations><!-- 将非可视元素（例如服务、值对象）放在此处 --></fx:Declarations><s:Panel title="选择器"><s:VScrollBar x="190" y="-1" height="100%" viewport="{appids}"/><s:VGroup id="appids" left="10" height="100%" clipAndEnableScrolling="true"></s:VGroup><s:controlBarContent><s:Button label="确定" click="button1_clickHandler(event)"/><s:Button label="取消"/></s:controlBarContent></s:Panel></s:Application>