Bar segment with mode bit BAR_BUTTON works as a button and, when pressed, sends this message to the window which owns bar. wParam contains column, lParam is 0. OllyDbg ignores value returned by this message.
Bar segment with mode bit BAR_BUTTON works as a button and, when pressed, sends this message to the window which owns bar. wParam contains column, lParam is 0. OllyDbg ignores value returned by this message.