RAD Studio VCL Reference
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Performs tasks when the mouse wheel is rotated upward.
function DoMouseWheelUp(Shift: TShiftState; MousePos: TPoint): Boolean; override;
virtual __fastcall Boolean DoMouseWheelUp(TShiftState Shift, TPoint MousePos);
Override DoMouseWheelUp to perform tasks when the mouse wheel is rotated downward.
DoMouseWheelUp should return false if the control's parent should handle the message.
In TCustomGrid, DoMouseWheelUp decrements the current row and returns true.
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