Flex2 Tree从XML文件中加载数据

<?xml version="1.0" encoding="utf-8"?>
<mx:Application xmlns:mx="http://www.adobe.com/2006/mxml" 
    fontFamily="simsun" fontSize="12" 
    layout="absolute" creationComplete="menu.send();" width="242" height="442">
<mx:Script>
    <![CDATA[
        import mx.collections.ArrayCollection;
        import mx.rpc.events.ResultEvent;
        [Bindable]
        private var menus:XML;
        private function LoadMenu(event:ResultEvent):void{
            menus = XML(event.result);
            var results:XMLList = menus.node;
            tree.dataProvider = results;
        }
    ]]>
</mx:Script>
    <mx:HTTPService url="TreeMenus.xml" id="menu" useProxy="false" 
        showBusyCursor="true" result="LoadMenu(event)" resultFormat="xml"/>

    <mx:Tree id="tree" x="10" y="35" width="218" height="397" labelField="@label" />
    <mx:Label x="10" y="10" text="Tree Nodes From XML File"/>
</mx:Application>

<?xml version="1.0" encoding="utf-8"?>
<menus>
    <node label="Mail">
        <node label="Inbox"/>
        <node label="Personal Folder">
            <node label="Demo"/>
            <node label="Personal"/>
            <node label="Saved Mail"/>
            <node label="bar"/>
        </node>
        <node label="Calendar"/>
        <node label="Sent"/>
        <node label="Trash"/>
    </node>
</menus>