Launching a Centered Pop-Up Window HELP!

I am very new to FLASH8 and found the tut. mentioned in the subject line. I got it to work just fine as is. I can also get it to work with a bitmap button image.

My question in, how can this same thing work with a transparent button above a bitmap image on the stage as the background?

I am using a Premium Page Flip component by http://www.page-flip.com/

In this component you have swf files within the main swf. In this case the tecnique described in the tut. dosn’t work. Can anyone tell me why? is it due to the nested swf? How can I overcome this? See a sample here; http://www.edward-ramos.net/AndrewBoyce/index.htm