I seem to recall some ways to try to influence where the dialog box appears, but the X window manager can interfere in ways you may have a hard time controlling. Since the dialog box is going to appear in a new top level window, its placement is less under your control.
In reply to Re: Tk - Place DialogBox in middle of top window
by herveus
in thread Tk - Place DialogBox in middle of top window
by Dirk80
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