Flash cs3 - using loadClip to load image into empty clip and I want to know the _width of the clip after the image is loaded

I have an empty movieclip that I am loading an image into dynamically. I am using a listener to know when the image is loaded completely and then I want to know the width and height of that clip AFTER the image is loaded. My problem is, everything I try the clip still stays it is 0px wide and 0px high even after the image is loaded. Does loading an image into the clip not change it's dimensions? Is there anyway to tell what size the image is inside the clip after it's loaded? Thank you.

var mcLoader:MovieClipLoader = new MovieClipLoader();
		var mclListener:Object = new Object();
		mclListener.onLoadComplete = function(target_mc:MovieClip, status:Number):Void {
			trace(_root.ThumbClip._width + ' x ' + _root.ThumbClip._height);
		};
		mcLoader.addListener(mclListener);
		mcLoader.loadClip('http://' + _root.t, _root.ThumbClip);

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