Question: Inventing a Flash pita

Hi guys, I'm working on a wacky idea and I'm really hoping that some of you guys have any helpful or enlightening thoughts.

I'm trying to do a web design experiment that can be summed up most simply as creating an swf file in TGF2 and then importing it onto the stage of a larger existing project in Flash CS5 (which of course would later be exported as a more complex swf).

...but whenever I import the file, the TGF2 swf appears invisible both on Flash's stage and when I hit Ctrl+Enter (Test Movie). As a matter of fact, the only indication that I've done anything at all when I try to bring the TGF2 swf to the stage: a couple of empty keyframes are created on the timeline.

Just to be clear, I don't have any interest in decompiling my TGF2 swf or editing it in Flash (unless that will specifically help), I just want to be able to put my TGF2 project on the Flash stage.

Like I said above, any helpful or enlightening thoughts would be appreciated. Thanks ahead. :)