Hover captions help?

http://www.kirupa.com/developer/mx2004/hover_captions.htm

I went through this tutorial and was able to achieve this effect on an interface I’m working on. However, if I try to get more creative with it, the captions do not appear. Basically, I want my icons to serve as a subnavigation with the captions to appear for usability reasons. I’ve tried several techniques such as masking, moving the timeline, and dynamically loading the movieclip but to no avail. The captions won’t appear when the icons are in a movieclip acting as a subnav. The captions only appear when I place my icons and captions on my main index.

I appreciate any response. thanks =)