Private classes in AS3?

There’s probably an easy answer to this question, but I can’t figure it out . . .

I’m new to AS3 (and am working in Flash CS3). I have a movie clip in my library, and have assigned a class to it through the Linkage Properties dialogue box. Is there any way I can specify that this is a private class? The reason why I need to do this is that the swf that I create through my Flash file will be embedded in another swf, and I’ve been having some problems with conflicts.

Any thoughts would be appreciated.

thanks,
prehensile