setMask and external swfs?

I can’t seem to get the setMask to work on external swfs that are loaded into “container” movie clip.

However I got it to work with normal movie clips (not external)… so is there something I should know about masking an external swf? :stuck_out_tongue: Any idea what I could be doing wrong?

And yes, I’m very new to flash :slight_smile:

current as:
[AS]container.setMask(maski);[/AS]