grid bug?

hi all,
I am playing with GridCustTable.py from demo directory
in winXP. I made font a little bigger and put size
smaller for grid,
same as in demo, when i add lines in grid a lot, then
when i press up,down arrow key works ok with
appropriate grid screen update, but from the bottom
line, when i press pgup, pgdn key, grid screen does
NOT go to top line.
where can i change line for this?
thanks in advance
john

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