Buttons within movie clip with actionscript not working

1

I have a mc which, on rollOver, scrolls down to a visible part of the screen and has a menu of say 10 options in it.

Im using the tweening prototypes available at http://laco.wz.cz/tween to move the mc down on rollOver. Here is my code on the MC:

on (rollOver){
this.tween("_y",30,.5,“easeOutSine”);

}
on (rollOut){
this.tween("_y",-321,2,“easeOutSine”);

}

simple. Now when I swf it, I roll over the mc, it scrolls down to where it should be, but no buttons (or other mc’s with actionscript) works within the mc.

Is there a way around this?

Thanks!