<span style="font-style: italic;">> >>> box.cancel(command = lambda a,b : a+b )</span><br style="font-style: italic;"><span style="font-style: italic;">> Traceback (most recent call last):</span><br style="font-style: italic;"><span style="font-style: italic;">> File "</span><pyshell#12 style="font-style: italic;">", line 1, in ?</pyshell#12><br style="font-style: italic;"><pyshell#12 style="font-style: italic;">> box.cancel(command = lambda a,b : a+b )</pyshell#12><br style="font-style: italic;"><pyshell#12 style="font-style: italic;">> AttributeError: _dummyButton instance has no __call__ method<br><br style="font-style: italic;"></pyshell#12>you should use box.cancel.config(command=my_callback) AFAIK<br style="font-style: italic;"><br><p>
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