Positioning issues

Hello!

I’m trying to create the following: and failing:

I want a movieclip to first be at the center of the stage, then when you press a button or whatever, I want it to tween to the top right.

I want to use MC Tween for the tweening animation, if possible.

Since I’m an Actionscript newbie, I decided to ask you guys. So any ideas?

Thanks in advance!