Couple button questions. Enlarge control on mouse over.

[jminnie]

Is there a way to make a button, icon or bitmap enlarge on mouse rollover?

And, is there a way to deactivate (gray out?) a button until a certain screen is reached or action is performed in a dialog?

Finally, thank you Gin for making such a spectacular program and thank you for being such a big help for newbies like me!

Thanks