in reply to error:not a Tk object error, please help.

What did you expect? When the MainWindow is closed, so are all its children, including $t1. You either want another MainWindow, or a Tk::Dialog .
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Re^2: error:not a Tk object error, please help.
by Anonymous Monk on May 19, 2008 at 08:01 UTC
    also $spawn_button