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OptionMenu is modified. Somewhat rewritten and elaborated by myself. class _setit: The constructor now takes an optional argument `callback' and stashes this in a private variable. If set, the __call__() method will invoke this callback after the variable's value has changed. It will pass the callback the value, followed by any args passed to __call__(). class OptionMenu: The constructor now takes keyword arguments, the only one that's legally recognized is `command', which can be set to a callback. This callback is invoked when the OptionMenu value is set. Any other keyword argument throws a TclError.