Controlling nested MC and locking a frame in it

I’ve got different skins on my flash site. the site becomes skinned when a user clicks a skin button and the related MC’s in my movie go to the appropriate labelled frames with the .png graphics for that skin.

I pretty much just use go to and stop for that and it works great on static (non-animated MC’s). I’ve got one situation though where my MC is animated (it slides up and out of the way to reveal content underneath).
I need to be able to tell that MC to go to and stop on the correct frame and then STAY THERE! I’m having trouble figuring out how to make it stay there. At present it defaults back to its first frame whenever it is tweened (animated).

hope i have explained this well and thanks for any help!