Provide a Horizontal Scroll Event for a Listbox Subclassing a listbox allows you to monitor horizontal scrolling. To subclass a listbox, you store the original WndProc in the UserData area of the listbox, allowing a single replacement of WndProc to work for all ListBox controls. WndProc notifies your form of a horizontal scroll message by sending a WM_MOUSEMOVE message with negative coordinates. The MouseMove event receives negative X and Y values, plus a Button value when horizontally scrolled, which is impossible under normal operation. Be sure to restore the original WndProc in the Form_Unload event:

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