[wxPython] seg fault when using wxGrid

I get a seg fault whenever I try to set the value of a cell in a
row/column that doesn't when exist using wxGrid. I know that that is
something I shouldn't do, but seg faulting doesn't seem like the right
response. It took me a while to figure out what I was doing that was
cuasing the seg fault and a traceback would have been much better.

I'm on wxPython 2.2 with python 1.5.2 on debian.

^Roman