MQL5 ReferenceStandard LibraryPanels and DialogsCWndClientOnScrollLineUp CreateOnEventColorBackgroundColorBorderBorderTypeVScrolledHScrolledCreateBackCreateScrollVCreateScrollHOnResizeOnVScrollShowOnVScrollHideOnHScrollShowOnHScrollHideOnScrollLineDownOnScrollLineUpOnScrollLineLeftOnScrollLineRightRebound OnScrollLineUp The virtual handler of the VScroll (vertical scroll) dependent control "ScrollLineUp" (vertical scroll line up) internal event. virtual bool OnScrollLineUp() Return Value true - event processed, otherwise - false. Note The base class method does nothing and always returns true. OnScrollLineDown OnScrollLineLeft