How can I get this to work?

I am following the hover caption tutorial from
My flash file has 2 scenes and in the second scene I have a movieclip with many buttons, these are where I would like to get the hover captions to appear.
However when I copy the tutorial exact and add it to the frames in my movie clip where the buttons are it does not seem to work.
I have tested that the hover captions work when I put them on the frames directly on the scene not in a movieclip and they work fine but I can’t seem to get it to work within the movie, what do I need to change to get it to work, any ideas would be appreciated? Or is there another tutorial I should be following to get this effect? If I haven’t explained this very well let me know, could really do with the help, thank you.