External SWF loads, but does not display

Question

So this is similar to a problem I had a few days ago, but not quite the same. If I try to load an external SWF, it loads all right, but I can't see anything! There are buttons in this external SWF, and I can click the buttons and they work, so the SWF is there and functional, I just can't see any of it (the screen is completely white). Also if I click the button, IT appears (with the active frame of its animation) but nothing else does. The audio also plays on its cue. Everything seems to work except that it's invisible.

This is the relevant code:

private var myLoader:Loader = new Loader();
private var url:URLRequest = new URLRequest("../lib/Introduction.swf");
private var introdummy:Sprite;

(different method)

introdummy = new Sprite();
addChild(introdummy);
myLoader.load(url);
myLoader.contentLoaderInfo.addEventListener(Event.COMPLETE, introLoaded); 

function introLoaded(event:Event):void 
{ 
     introdummy.addChild(myLoader.content);  
}

Answer 1

OK, you all are going to laugh your butts off when you see what was wrong...

My main SWF has a white background. My external SWF has a black background, and all the text on it was white. When I imported the SWF in, the background showed the main SWF's background. So all the text showed as white on a white background, so it was invisible. :/

Answer 2

add your swf file like this:

introdummy.addChild(myLoader);