I've got a Windows Application with multiple forms. One is the Menu.jsl form
and the other is a Checkers.jsl form. The user clicks a button in the Menu
form to open Checkers. When this happens, I want the opacity of Menu.jsl to
change to 50%. When Checkers is closed, I want the opacity to return to 100%
(or 0%, whichever is a solid color, not transparent). How can I do that? I
can't do it completely in the Menu form because it doesn't recognize when the
Checkers form is open / closed.