Serhiy Storchaka added the comment:
This is not Tkinter bug, this is normal Tk behavior. Here is minimal reproducer
on Tcl/Tk :
button .b -text "Click me"
bind .b <Button-1> {tk_messageBox -message "The button is sunken!"}
pack .b
I suppose the button is left sunken because the message box steals a focus.
In general binding mouse click event for button is not a good idea, because it
makes a button non-usable with keyboard. Use the "command" option.
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nosy: +serhiy.storchaka
resolution: -> not a bug
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<http://bugs.python.org/issue11387>
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