Refresh wxtreectrl on Mac

[bray at sent.com]

Hello:

My treectrl inside a wxDialog, (based off the treectrl sample wxMac
2.6.3) when embedded into a dylib (and dll on windows) does not redraw
itself on the mac. On windows, it works fine. The only difference is I
send a parent wxWindow on Windows. On the mac, its NULL. Its getting
events, but I can not tell what is going on because it rarely redraws
itself. If I call Refresh() in an event, it redraws. How do I get it to
redraw without calling Refresh all the time?

Any Ideas?

--Brian