Flash Masked buttons/mc issues...help!

Having some strange problems with masks in FMX 04:

We’re developing an accordian style interface. The problem is that buttons and images/mcs that are outside the “masked area” of each module are somehow clickable, or are “invisibly” pushing other content up/down.

So basically the buttons/mcs are hidden, but Flash is still seeing them somehow.

Is this normal mask behaivior? Is there a solution besides setting the button to _visible = false? This is effecting my interface in other ways as well.

Any help is appreciated.