How do I get modal windows to clear when I hit exit?

 I have 3 modal windows that when I hit exit or close window, the window does not erase off the screen.  These windows are not the root window.  They are pop-up windows that the user wants to see simultenously with the root window.  The modal windows can be moved, maximized, minimized, but not closed.  I have set the Property Visible to off, but it still won't erase off the screen. I have triggers for When Window deactivated and when window closed that sets the visible property of the window to off, but nothing happens.  Any ideas?

Thank you.