http://qs1969.pair.com?node_id=224186
Description:

The following will remove the title-bar and all other window-manager decorations, such as the minimize, maximize, and close buttons from a Tk::Toplevel.

$toplevel->overrideredirect(1);

# To bring the decorations back, you would call it with a 0:
#$toplevel->overrideredirect(0);
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