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>