Find Stage Width of External Swf?

Hello, I’m having troubles finding the stage width of external swfs I’m loading into my main swf.

Basically, I’m making a web page with a main swf that loads external swfs into it (it only displays one external swf at a time into the holder_mc). I have a dragbar_mc that hovers above the external swf (once it’s loaded) - the user can move the external swf around by clicking and dragging the drag bar.

[LIST]
[*]My problem is that I can’t figure out how to make the drag bar always the same width as the external swf’s stage.[/LIST]I’ve been using the following code, but it doesn’t actually give me the stage width, just the width of all the items combined:

dragbar_mc._width = holder_mc._width;

Any help would be seriously appreciated.