tk/wm withdraw

(tk/wm 'withdraw #<widget>)
Arranges for #<widget> to be withdrawn from the screen. This causes the window to be unmapped and forgotten about by the window manager. If the window has never been mapped, then this command causes the window to be mapped in the withdrawn state. Not all window managers appear to know how to handle windows that are mapped in the withdrawn state. Note: it sometimes seems to be necessary to withdraw a window and then re-map it (e.g. with tk/wm deiconify) to get some window managers to pay attention to changes in window attributes such as group.

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