Python megawidgets / Discussion / Help: problem with OptionMenu.setitems()

I'm getting an exception when I call Pmw.OptionMenu.setitems(). I originally developed an application using Python 2.5 under win32. Now that I'm trying to upgrade to Python 2.6.2 I've run into this problem - it also occurs with Python 2.5.4.

I hacked up the OptionMenu.py demo to demonstrate the problem (see below).
When you click on the first OptionMenu it is supposed to change the items in the second OptionMenu. Has anyone else seen this? Is there a fix?

Thanks
Raj

C:\temp>c:\Python26\python.exe OptionMenuProblem.py
change type to mineral
<class '_tkinter.TclError'> Exception in Tk callback
Function: <function <lambda> at 0x0300B630> (type: <type 'function'>)
Args: ()
Traceback (innermost last):
File "c:\Python26\lib\site-packages\Pmw\Pmw_1_3\lib\PmwBase.py", line 1747, in __call__
    return apply(self.func, args)
File "c:\Python26\lib\site-packages\Pmw\Pmw_1_3\lib\PmwOptionMenu.py", line 73, in <lambda>
    command = lambda self = self, item = item: self._invoke(item))
File "c:\Python26\lib\site-packages\Pmw\Pmw_1_3\lib\PmwOptionMenu.py", line 146, in _invoke
    return command(text)
File "OptionMenuProblem.py", line 47, in _changeType
    self.thing_menu.setitems(self.types[type], 0)
File "c:\Python26\lib\site-packages\Pmw\Pmw_1_3\lib\PmwOptionMenu.py", line 67, in setitems
    self._menu.delete(0, 'end')
File "c:\Python26\lib\lib-tk\Tkinter.py", line 2675, in delete
    self.deletecommand(c)
File "c:\Python26\lib\lib-tk\Tkinter.py", line 358, in deletecommand
    self.tk.deletecommand(name)
<class '_tkinter.TclError'>: can't delete Tcl command

C:\temp>c:\Python26\python.exe
Python 2.6.2 (r262:71605, Apr 14 2009, 22:40:02) [MSC v.1500 32 bit (Intel)] on win32
Type "help", "copyright", "credits" or "license" for more information.
>>> ^Z

--------- cut here ----------------
title = 'Pmw.OptionMenu.setitems() problem'

# Import Pmw from this directory tree.
import sys
sys.path[:0] = ['../../..']

import Tkinter
import Pmw

class Demo:
    def __init__(self, parent):
        # Create and pack the OptionMenu megawidgets.
        # The first one has a textvariable.

        self.types = {
            'animal' : [ 'dog', 'cat', 'cow', 'horse', 'sheep' ],
            'vegetable' : [ 'cabbage', 'carrots', 'peas', 'beans', 'rice' ],
            'mineral' : [ 'copper', 'gold', 'coal', 'tin', 'iron' ]
        }

        self.var = Tkinter.StringVar()
        self.var.set('animal')
        self.type_menu = Pmw.OptionMenu(parent,
                labelpos = 'w',
                label_text = 'Choose type:',
                menubutton_textvariable = self.var,
                items = self.types.keys(),
                menubutton_width = 10,
                command = self._changeType,
        )
        self.type_menu.pack(anchor = 'w', padx = 10, pady = 10)

        self.thing_menu = Pmw.OptionMenu (parent,
                labelpos = 'w',
                label_text = 'Choose thing:',
                items = self.types['animal'],
                menubutton_width = 10,
        )
        self.thing_menu.pack(anchor = 'w', padx = 10, pady = 10)

menus = (self.type_menu, self.thing_menu)
Pmw.alignlabels(menus)

    def _changeType(self, type):
        print('change type to ' + type)
        self.thing_menu.setitems(self.types[type], 0)

######################################################################

# Create demo in root window for testing.
if __name__ == '__main__':
    root = Tkinter.Tk()
    Pmw.initialise(root)
    root.title(title)

    exitButton = Tkinter.Button(root, text = 'Exit', command = root.destroy)
    exitButton.pack(side = 'bottom')
    widget = Demo(root)
    root.mainloop()

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problem with OptionMenu.setitems()