menuBar实例

<? xml version="1.0" encoding="utf-8" ?>
< mx:Application  xmlns:mx ="http://www.adobe.com/2006/mxml"  layout ="absolute"  creationComplete ="initApp()" >
     < mx:Script >
         <![CDATA[
            import mx.events.*;
            import mx.controls.Alert;
            //在ActionScript中定义XML数据的时候，可以使用换行符，编译器会自动识别，
            private var mXML:XMLList=
                <>
                    <item label="文件">
                        <node label="新建画板" data="new"/>
                        <node label="清除画板" data="clear" enabled="false"/>
                        <node type="separator"/>
                        <node label="退出系统" data="logout"/>
                    </item>
                    <item label="帮助">
                        <node label="帮助" data="help"/>
                        <node label="关于作者" data="about"/>
                    </item>
                </>;
                
            internal function initApp():void{
                myMenu.dataProvider=mXML;
                myMenu.addEventListener(MenuEvent.ITEM_CLICK,menu_click_handler);
            }
            internal function menu_click_handler(evt:MenuEvent):void{
                //Alert.show("选择菜单:"+evt.item.@data,"提示信息");
                //这有错误！不知道为什么
            }
         ]]>
     </ mx:Script >
     < mx:VBox  x ="19"  y ="10"  height ="302" >
         < mx:Canvas  width ="200"  height ="74" >
             < mx:MenuBar  x ="0"  y ="0"  id ="myMenu"  labelField ="@label" ></ mx:MenuBar >
         </ mx:Canvas >
         < mx:Canvas  width ="200"  height ="200"  id ="paper" >
         </ mx:Canvas >
     </ mx:VBox >
</ mx:Application >