int code = OS.DefWindowProc (handle, OS.WM_MOUSEWHEEL, wParam, lParam); return new LRESULT (code);
return null;
LRESULT WM_MOUSEWHEEL (int wParam, int lParam) {	/*	* Feature in Windows.  If the WM_MOUSEWHEEL is handled by	* the control, it may not send WM_VSCROLL and WM_HSCROLL	* messages.  The fix is to intercept the WM_MOUSEWHEEL message	* and call the DefWindowProc which will convert the message to 	* send the appropriate WM_HSCROLL or WM_VSCROLL message.	*/	int code = OS.DefWindowProc (handle, OS.WM_MOUSEWHEEL, wParam, lParam);	return new LRESULT (code);}