[Tutor] Tix: binding

[hk at pop.ms]

I am looking at Tix and I am stuck with what seems to be a simple problem:

I want to bind the cancel buttom of a ExFileSelectBox to a routine in my class, but can not make it work.
I guess the problem is the same for any binding of tix sub-widgets, so if someone could send some sample code.
>>> import Tix
>>> root = Tix.Tk()
>>> box = Tix.ExFileSelectBox(root)
>>> print box.subwidget(name='cancel')
.11827520.bf.cancel                            #so the sub-widget cancel buttom is there

But how to bind it ?

>>> box.cancel(command = lambda a,b : a+b )
Traceback (most recent call last):
  File "<pyshell#12>", line 1, in ?
    box.cancel(command = lambda a,b : a+b )
AttributeError: _dummyButton instance has no __call__ method

Or

>>> box.subwidget(name='cancel' , command = lambda a,b : a+b )
Traceback (most recent call last):
  File "<pyshell#13>", line 1, in ?
    box.subwidget(name='cancel' , command = lambda a,b : a+b )
TypeError: subwidget() got an unexpected keyword argument 'command'

So, it seems I can not bind to command, but what then ?
>From the Tix docu I thought the buttoms are normal Tkinter widgets ?
-- 
Harm