flex中使用httpservice读取xml文件

1、mian.mxml
<?xml version="1.0" encoding="utf-8"?>
<mx:Application xmlns:mx="http://www.adobe.com/2006/mxml"
layout="absolute" creationComplete="HTTPSrv.send();" width="242" height="442">
<mx:Script>
<!--[CDATA[

import mx.rpc.events.ResultEvent;
[Bindable]
private var pro:XML;
private function LoadMenu(event:ResultEvent):void{
pro= XML(event.result);
var results:XMLList = pro.project;
tree.dataProvider = results;
}
]]-->
</mx:Script>
<mx:HTTPService url="Project.xml" id="HTTPSrv" useProxy="false"
showBusyCursor="true" result="LoadResulter(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>

2 project.xml
  <?xml version="1.0" encoding="utf-8"?>
<projects>
<project >
<project name="PhotoTurning" >
<project name="assets" >
<project name="photo" >
<project name="3dphoto_1.png" />
<project name="3dphoto_2.png" >
</project>
</project>
<project name="flex_src">
<project name="view" >
<project name="components" >
<project name="PhotoTurning.mxml" />
</project>
</project>
</project>
</project>
</project>
</projects>