flex Alert 提示使用

<?xml version="1.0" encoding="utf-8"?><mx:Application xmlns:mx="http://www.adobe.com/2006/mxml" layout="absolute" fontSize="15"><mx:Script><![CDATA[import mx.events.CloseEvent;import mx.controls.Alert;private function onClick():void {Alert.show("Hello World!");}private function onClickTitle():void {Alert.show("Hello World！","这里是标题");}private function onClickConfirm():void {Alert.yesLabel = "是";Alert.noLabel ="否";Alert.show("Hello World!","这里是标题",3,this,onCloseHandler);}private function onCloseHandler(e:CloseEvent):void {if(e.detail == Alert.YES){alertResult.text = "你选择的是：“是”";} else if (e.detail == Alert.NO) {alertResult.text = "你选择的是：“否”";} else if (e.detail == Alert.CANCEL) {alertResult.text = "你选择的是：“取消”";}}private function onClickHandler():void {Alert.yesLabel = "是";Alert.noLabel = "否";Alert.cancelLabel = "取消";Alert.show("Hellow World!","这里是标题！",1|2|8,this,onCloseHandler);}]]></mx:Script><mx:Button label="弹出1" click="onClick()" x="77" y="62"/><mx:Button label="弹出2" click="onClickTitle()" x="232" y="62"/><mx:Button label="弹出3" click="onClickConfirm()" x="394" y="62"/><mx:Button label="弹出4" click="onClickHandler()" x="546" y="62"/><mx:Label text="结果：" x="77" y="206"/><mx:Label id="alertResult" x="211" y="206"/></mx:Application>