Well... technically it isn't exiting the frame to play more movie clips.
It's called a transition.
Basically something like this is going on (this example uses MC.Tween)
Code:
nextBtn.onRelease = function(){
oldMC.tween("_y", "-6000", 1.0);
if (oldMC._y == -6000) {
newMC.tween("_x", "350", 1.0);
}
Now obviously that isn't a working code, for one you need MC Tween installed. And second I just wrote it off the top of my head. But You can get the idea.
The actions of the transitions are linked to the pressing of the buttons, not the end of the MC's frame.
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