Dialog Box in the Center of the Screen . . .

[Roger Guay]

I have a narrow (180 pixels) "Palette" style stack on the extreme left 
edge of the screen from which I call up an "answer" dialog box.  On the 
Mac (OS X) this dialog box is centered on the screen, but in the 
Windows environment this dialog box is centered on the "Palette" stack 
and is therefore partially offscreen.  How can I make this dialog box 
appear in the center of the screen on the Windows platform?

TIA, Roger