Thanks for your suggestion. I tested your code and I found one problem. If the user close the TopLevel window by clicking the X on the window's top-right corner instead of clicking the Close button., the user can not open any Toplevl window any more. Please help. Thanks

In reply to Re^2: how to prevent more than 1 tk Toplevel windows from opening by henry888
in thread how to prevent more than 1 tk Toplevel windows from opening by henry888

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