lResult = SendMessage( // returns LRESULT in lResult
(HWND) hWndControl, // handle to destination control
(UINT) TB_SETBUTTONWIDTH, // message ID
(WPARAM) wParam, // = 0; not used, must be zero
(LPARAM) lParam // = (LPARAM) MAKELONG (cxMin, cxMax)
);


what is makelong? i want to set the min and max values..