Buttons in a moving movieclip

Hi sorry to ask this as it is probably very easy.

I am trying to create a menu system for a web site in Flash MX 2004, it is going to be a series of coloured bars with a button on each which will take you to diiferent parts of the site.

Each bar is a movieclip, which has a button embed in it, this all works fine if the bars are left static, you can navigate ronud the site. However I would like the bars to slide in from the side of the screen. I can get the movement to work, but once I move the bars the buttons stop responding.

Any Ideas??