The framework calls this member function as a user rotates the mouse wheel and encounters the wheel's next notch.
Horizontal position of the pointer.
Vertical position of the pointer.
Unless overridden, OnRegisteredMouseWheel routes the message to the appropriate window (the parent window with focus), and calls the WM_MOUSEWHEEL handler for that window.
Override this member function to provide your own message routing or to alter the mouse-wheel scrolling behavior.
OnRegisteredMouseWheel handles messages for Windows 95/98 and Windows NT 3.51. For Windows NT 4.0 message handling, use OnMouseWheel.