Stage.width, Stage.height, add.Listeners problem

i found the way yesterday to ensure my mc stays full screen. now i want to animate the same mc if i can in reaction to a button click.

not sure how this next step goes. do i need another addlistener to the background mc that im tweening ?

kindly check the .fla. to see what i mean.
its very rough cut but hopefully you can get the gist of it.
when the text button is clicked, the bg reverts to the top left of the screen.