Return value on function

So I’m using the Full-Browser scrollbar for AS3, and am trying to customize it a bit in terms of the look of it, so in OBO_FullScrollBar.as, I’m modifying the createScroller method and am using a Loader to grab another SWF’s (assets/swfs/assets.swf) library.

In that library, I have a scroller MovieClip with a linkage ID of “Scroller”. My onLoadComplete method looks like this:

var scroller:Class = e.target.applicationDomain.getDefinition("Scroller");
            var temp:DisplayObject = new scroller();

So I end up with a DisplayObject of that Library item.

My problem is this:

How do I return that DisplayObject in the createScroller method (the swf obviously has to load before it is returned)?