Strang behavior when adding movieclip

1

i’m just trying to add a graphic on top of a loaded image. Mrk is the graphic in the library. When i try and it below it doesn’t show up. even if i comment out temp.addChild(my_thumb); it doesn’t show up. anyone have any idea why this would be?

function thumbLoaded(e:Event):void {

var my_thumb:Loader=Loader(e.target.loader);


var bit:Bitmap=e.target.content;


if(bit != null){
    bit.smoothing = true;
}
my_thumb.content.width=72;;
my_thumb.content.height=72;;

var temp:MovieClip=new MovieClip  ;
temp.addChild(my_thumb);
    
var mark:Mrk = new Mrk;
temp.addChild(mark);

container_mc.addChild(temp);

}