SetClientData doesn't work with wxCheckListBox?

This seems to be the case. If I define the control as wxListBox,
SetClientData works fine. If instead I define it as wxCheckListBox, the
call to SetClientData seems to work, but then apparently after returning to
the event loop I get an error when an attempt is made to read at memory
location 0x00000015.

Has anyone else seen this?

Particulars: Windows NT, Python 2.3 (Enthought Edition), wxWindows 2.4.1.

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Gary H. Merrill
Director and Principal Scientist, New Applications
Data Exploration Sciences
GlaxoSmithKline Inc.
(919) 483-8456