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