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I'm having an issue with the grab_set command when opening a toplevel window on my Pi. I'm using a grab_set to disable the screen below the toplevel and releasing it on close of the window.

I doesn't happen every time but on occasion I will get this error: _tkinter.TclError: grab failed: window not viewable

The window will appear but the grab didn't work. Is there a way to fix this?

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