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How can I implement some caching in a virtual grid?
If you want to implement some kind of caching, you might override the OnDraw() method. There, you could determine the top row with
|nFirstRow = GetTopRow();|
and the bottom row of the grid with
|nLastRow = CalcBottomRowFromRect(GetGridRect());|
You could then check these rows to see if they fit into your current cached page and load/unload the rows from your cache appropriately.