Help with centered pop-up window

Hi everyone, I’m having some trouble with the centered pop-up tutorial

I did a search before making this thread, but none of the threads I saw seemed to give me the solution to my problem.

I have this movieclip within another movieclip in one of the scenes in my movie, wich has a button inside (the one I want to asign the pop-up action to); and I guess the fact that it’s not on the main timeline is the issue.

I’ve tried making a new movie and go step by step with the tutorial, and that way it works… so I assume that the code works only with buttons on the main timeline.

What I want know is if there’s any way I can modify a certain part of the code for the button to work properly… anyway, if this post is not clear enough please let me know and I’ll supply whatever information is missing.
Thanks in advance