public class SWFControl extends Sprite
  {
   private var _button:YourButton = null;
   //
   private var _loader:Loader = null;
   //
   private var _mc:MovieClip = null;
   //
   public function SWFControl()  
   {
    _button = new YourButton();
    this.addChild(_button);
    _button.addEventListener(MouseEvent.CLICK, clickListener);
   }
    
   private function clickListener(event:MouseEvent):void  
   {
    _button.removeEventListener(MouseEvent.CLICK, clickListener);
    _loader = new Loader();
    _loader.contentLoaderInfo.addEventListener(Event.COMPLETE, loadCompleteListener);
    _loader.contentLoaderInfo.addEventListener(IOErrorEvent.IO_ERROR, errorEventListener);
    _loader.load(new URLRequest("yourAddress"));
   }
    
   private function errorEventListener(event:IOErrorEvent):void  
   {
    trace("ACHTUNG!");
   }
    
   private function loadCompleteListener(event:Event):void  
   {
    _loader.contentLoaderInfo.removeEventListener(Event.COMPLETE, loadCompleteListener);
    _mc = _loader.content as MovieClip;
    this.addChild(_mc);
   }
    
  }

for each (var item:XML in xml.requirements )
{
var t:String = item.attribute("type");
var q:int = parseInt(item.attribute("quantity"));
var r:String = item.attribute("resourceType");
}