Movie clips - flash mx

Can 2 movie clips function at the same time in a scene?

I have 1 movie clip which is a navigation bar and appears in all scenes. The other movie clip appears only in scene 1 and I want it to disappear when moving on to scene 2 but it keeps on playing and the transition to scene 2 is not made.

How do I do it?

Thanks your help.
Kleb