Dynamic photo button not possible?

i’m trying to do what MLB.com did on their home page where the thumbnails are buttons. I can recreate the animation, etc but as soon as I use a dynamic photo (from an XML file) the instance loses all button behaviors. At first i thought I was references it wrong, but I don’t think that’s it.

So i’m guessing you can’t use dynamic movie clips as buttons? Can anyone confirm this or am I missing something?

ps I’m new to Actionscripting…like today’s my first day, so I’m really hope there’s something i’m missing.