Nav Button Text Problem

I searched the forums and didn’t find an answer to this so I’m posting the question. I’m developing my site in Flash CS4 and have created a nav button bar. the buttons work fine with the exception of the text over the buttons preventing the rollOver or click events of the buttons. Is there some way to inhibit this behaviour? The buttons are defined as buttons while the text is defined as a movie clip (I followed this tutrial from YouTube: which I believe is CS3 so I’m wondering if there is something I need to do differently in CS4).