How do I redraw dynamically created sprites onto the stage?

Help would be appreciated on this one guys:

I have placeholder sprites on my stage which, at runtime, are replaced with bitmap sprites (which themselves are contingent on previous runtime selections). These sprites are also buttons which send the play head on to play another section of the movie and then returns to this particular point.

When I return here, the original placeholder sprites (and not the new dynamically created sprites) are on the stage.

The cast member details of the new sprites are contained in a property list but I can't seem to access them after the playhead moves on.

I'd appreciate any thoughts on the matter. (I've not posted code etc. but I will if needed)

Thanks

Deq