You could use an animated panel. Here is the thread: http://www.opserver.de/ubb7/ubbthreads.php?ubb=showflat&Number=303814#Post303814
But you have to make a panel for every button.

Gamestudio: A7.82 Commercial/A8 Commercial
System specs (Laptop):
Windows 7 64bit
DirectX v10.1
Intel Core i7-720QM CPU @ 1,60 GHz
4GB DDR2 Ram
NVIDIA GeForce GT 230M (1024MB)