If I've understood your structure the way I think I have, the following should work. On your main timeline, add a new layer called Actions and on the frame that has the movieclip containing your buttons add a keyframe to this layer. Go to the movieclip that contains the buttons.
Open the actions panel and type Stop() . Create a new layer called Button actions click on the (blank) kayframe on this layer and add the following code.
Stage is available anywhere where the displayObject is linked to the stage. You can give a reference object to that control button. Your timeline object won't change so its fine.
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