I've just finished a first draft describing each of these classes, nothing really spectacularly insightful or detailed, but I've tried to give general overviews of each class, a taxonomy of methods, and any notes I have on implementation details. There are considerable number of questions for which I simply don't have answers. Feel free to fill in missing information.
http://wiki.wxpython.org/index.cgi/wxGrid_20Manual
Enjoy yourselves,
Mike
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Mike C. Fletcher
http://members.rogers.com/mcfletch/