Complex Button Tutorials

Hello

I am doing used the Complex Button Tutorial, and have run in to a problem. I have create a large square, and added a mask so when people roll over the top of it, it comes up. When you roll off, it then moves back down.

Now I am trying to add buttons, so they have options to click on when they are rolled over.

Not having any luck getting this to work. Any suggestions/hints would be great.

Thanks