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My system information:
------------------------------------------
uname -a:
Linux linux 2.6.4-52-default #1 Wed Apr 7 02:08:30 UTC 
2004 i686 athlon i386 GNU/Linux
Python:
Python 2.4.1 (#4, Jan 10 2006, 10:53:14) 
[GCC 3.3.3 (SuSE Linux)] on linux2
and
Python 2.3.5 (#1, Sep 12 2005, 14:56:24) 
[GCC 3.3.3 (SuSE Linux)] on linux2
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Using Tix you can produce the following exception:
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>>> from Tix import *
>>> tk = Tk ()
>>> b = Balloon ()
>>> b.subwidget ( 'label' )
Traceback (most recent call last):
 File "<stdin>", line 1, in ?
 File "/home/mkiever/pro/Python-2.4.1/Lib/lib-tk/Tix.
py", line 340, in subwidget
 return self._nametowidget(n)
 File "/home/mkiever/pro/Python-2.4.1/Lib/lib-tk/
Tkinter.py", line 1015, in nametowidget
 w = w.children[name]
KeyError: 'lab'
>>> 
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I found a commentary in Tix.py:TixWidget:__init__
stating that 'subwidget_list' should contain
Tix names. But in Tix.py:TixSubWidget:__init__
the python names are used, not the names returned
by Tix. 
I was successful with the following two
small additions (+++) near lines 400-450:
---------------------------------------------
class TixSubWidget(TixWidget):
 ...
 def __init__(self, master, name,
 destroy_physically=1,
 check_intermediate=1):
 ...
 if (not check_intermediate) or len(plist) < 2:
 # immediate descendant
 if check_intermediate: +++
 name = plist [0] +++
 TixWidget.__init__(self, master, None, None, 
 {'name' : name})
 else:
 ...
 name = plist [-1] +++
 TixWidget.__init__(self, parent, None, None,
 {'name' : name})
 self.destroy_physically = destroy_physically
...
---------------------------------------------
This replaces the python name by the name
returned from Tix.
I have not extensively tested this (sorry).
Hope this helps.
Matthias Kievernagel (mkiever@web.de)

Logged In: YES 
user_id=1477880
Solution was not complete.
Submitted a complete patch #1472877 for this
which is tested against the tix demo code
in Demo/tix/tixwidgets.py
Matthias Kievernagel
mkiever at web dot de

Fixed with said patch.