Flex获取画布ID？

Question

I'm developing an engine to generate components. I want to get the XML script that reads and creates a component to load the component directly into the canvas 'content'. I not sure how I get the addChild() method to work correctly as in 'content'.addChild instead of the implementation shown below:

private function sidebar():void 
{
   xmlReq = new URLRequest("sidebar.xml");
   callReq(content);
}

private function callReq(cholder:Canvas):void 
{
   getHolder = cholder;
   getHolder.addChild(...)
}

<mx:Canvas x="0" y="123" width="100%" height="200" id="content">
 </mx:Canvas>

Answer 1

Start by Changing

getHolder = cholder;

to

var getHolder:Canvas = cholder;