python MRO in ClassGroupPropertiesCtrl

[Charles R. McCreary]

While stepping through the code using the Wing IDE debugger, python 
threw a MRO exception while processing
class ClassGroupPropertiesCtrl

Python: Python 2.4.4c1
wx: 2.6.3

Changing the inheritance from
class ClassGroupPropertiesCtrl(wxWindow, wxControl):
to
class ClassGroupPropertiesCtrl(wxControl,wxWindow):
fixes the MRO exception.