flex中动态调用remoteobject的问题

我的JAVA端返回的是一个LIST,如果用下面的方法,可以是能在页面加载时,得到服务端返回的数据的,即: 
?xml version="1.0" encoding="utf-8"?> 
<mx:Application xmlns:mx="http://www.adobe.com/2006/mxml" layout="absolute" creationComplete="srv.getCategoriesByPidflex()" width="706" height="417"> 
<mx:Script> 
<![CDATA[ 

import mx.controls.Alert; 
import mx.rpc.events.FaultEvent; 



private function findAllFaultHandler(event:FaultEvent):void 
{ 
Alert.show(event.fault.faultString, "Error"); 
} 

  private function clickHandler(event:Event):void {  
  trace(event.currentTarget.getRepeaterItem().@id);  
  }  

]]> 
</mx:Script> 

<mx:RemoteObject id="srv" destination="categoryservice"> 
<mx:method name="getCategoriesByPidflex" fault="findAllFaultHandler(event)"> 
<mx:arguments> 

<categoryid> 
144</categoryid> 

</mx:arguments> 
</mx:method> 
</mx:RemoteObject> 
<mx:VBox id="h" horizontalAlign="right" verticalAlign="bottom" h