virtual BOOL OnTopRowChange(ROWCOL nNewTopRow);?
nNewTopRow
Specifies the new value for the topmost scrollable row in the grid.
Nonzero if scrolling to the new row is possible. FALSE if the grid should abort the scroll operation.
This notification method is before the grid scrolls up or down.
You can override this method and return FALSE if you want to abort scrolling in specific contexts.
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