wxTreeListCtrl.AddRoot calls expandItem?

The AddRoot method seems to call expandItem(). In wxTreeCtrl, this doesn't
seem to happen. What's up with this?

(This is a problem for me since my expandItem method calls GetPyData and at
AddRoot time there ain't any data! Thus: boom!)

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