Occurs when the mouse wheel is rotated upward.
property OnMouseWheelUp: TMouseWheelUpDownEvent;
__property TMouseWheelUpDownEvent OnMouseWheelUp;
Write code in the OnMouseWheelUp event handler to perform actions when the mouse wheel is rotated upward. OnMouseWheelUp occurs only if the message is not already handled in an OnMouseWheel event handler.
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