Trouble with Centered Pop-Up

I read over the tutorial on how to launch a centered pop-up window. I can get the pop-up window to work correctly when the button I am using is on the main level of the movie.

The problem I am having is when I try to launch a centered pop-up window from a button in a scrolling area where the information there is loaded from another movie clip.

Any suggestions? Any more information I need to provide?

Thank you in advance.