loaderInfo.bytesLoaded not showing external img progress

programming flash
1

When I try loaderInfo.content it traces [object MainTimeline] but should trace the external image. Basically tracing loaderInfo.bytesLoaded does not trace the image progress. It should

 
  var objAimg:Array = new Array();
  var ldrA:Array = new Array();
  var [url:String](http://www.kirupa.com/forum/String);
  var urlReq:URLRequest;
 
objAimg[1] = new MovieClip();
addChild(objAimg[1])
 
   url = "test.jpg";
   urlReq = new URLRequest(url);
   ldrA[1] = new Loader();
   ldrA[1].load(urlReq);
   objAimg[1].addChild(ldrA[1]);
stop();
this.addEventListener(Event.ENTER_FRAME, dononstop, false, 0, true);
function dononstop(e:Event):void {
 trace(objAimg[1].loaderInfo.bytesLoaded)
}

anybody any clue why? probably something simple.
t.i.a