Attach movie clip to another movieclip (both are in library)

Is it possible to attach a movie clip to another moviecilp on the library using attachMovie () method
(on the fly).
Actually i want this for use the scrollPane component in flash mx. If it is possible the dynamically
populated movie clip having a scroll bar without using a customed scrollbar.

I’ve manually added a scollbar for the populated movieclip but that is not working.