Stage Overlaping Problems

I was wondering how to keep externally loaded swf’s which are loaded onto a larger main swf file in the constraints of the stage size set for the externally loaded files. I have things flying onto the loaded files stage but you can see them all over the main stage instead of just on the pre-determined stage size. I imagine its a simple fix but it has just never come up. I have Flash 8 if the helps but I don’t know why that would matter.