flex PopMenu(demo)

<?xml version="1.0" encoding="utf-8"?>
<mx:Application xmlns:mx="http://www.adobe.com/2006/mxml" layout="absolute" creationComplete="init()">
     <mx:Script>
        <![CDATA[
       //导入需要的包
            import mx.controls.Menu;
            import mx.events.MenuEvent;
            import mx.controls.Alert;          
            import flash.geom.Point;
            import flash.events.MouseEvent;
            //声明一个标明鼠标位置的类
            private var point1:Point = new Point();
            //声明菜单
            private var myMenu:Menu;
            //定义弹出菜单函数
             private function showMenu(event:MouseEvent):void {
             //创建弹出菜单，指明弹出菜单得内容
                myMenu= Menu.createMenu(panel, myMenuData, false);
                //指明弹出菜单，显示的字段
                myMenu.labelField="@label"
                //指明点击菜单项时响应的函数
                myMenu.addEventListener("itemClick", menuHandler);
                //得到鼠标的位置并弹出菜单
                point1.x=event.stageX;
                point1.y=event.stageY;
                myMenu.show(point1.x , point1.y);
            }
            //定义函数响应点击菜单事件
            private function menuHandler(event:MenuEvent):void {
            //定义一个连接请求URLRequest对象实例
            var searchRequest:URLRequest;
            //如果点击删除菜单
            if(event.item.@eventName=="delete")
            {
               //清空source_txa内容
                 source_txa.text="";
             }
             //如果点击百度搜索菜单
             else if(event.item.@eventName=="baidu")
             {
                //使用百度搜索source_txa.text内容
                searchRequest = new URLRequest("http://www.baidu.com/baidu?word="+source_txa.text);
                //打开搜索结果页面
      navigateToURL(searchRequest);
             }
             //如果点击Google搜索菜单
             else if(event.item.@eventName=="google")
             {
                //使用Google搜索source_txa.text内容
                searchRequest = new URLRequest("http://www.google.cn/search?q="+source_txa.text);
                //打开搜索结果页面
      navigateToURL(searchRequest);
             }
            }
            //初始化函数  
            private function init():void{
            //设定监听source_txa组件的点击函数
            source_txa.addEventListener(MouseEvent.CLICK,showMenu);
             }
        ]]>
    </mx:Script>
    <!-- 设定菜单内容的数据-->
<mx:XML id="myMenuData">
        <root>
            <menuitem label="删除" eventName="delete"/>
             <menuitem label="搜索" eventName="search">
             <menuitem label="使用百度" eventName="baidu"/>
             <menuitem label="使用google" eventName="google"/>
            </menuitem>
        </root>
    </mx:XML>
    <!--定义Panel作为菜单的容器 -->
<mx:Panel id="panel" width="60%" height="60%" layout="horizontal" horizontalCenter="0" verticalCenter="0" title="弹出菜单">
   <mx:Form width="50%">
    <mx:FormHeading label="弹出菜单演示"/>
    <mx:FormItem label="说明">
       <!--定义TextArea组件响应点击事件 -->
     <mx:TextArea id="source_txa" editable="false" selectable="false" text="Flex入门"/>
    </mx:FormItem>
   </mx:Form>
</mx:Panel>
</mx:Application>