MQL5 ReferenceStandard LibraryPanels and DialogsCWndClientOnVScrollShow CreateOnEventColorBackgroundColorBorderBorderTypeVScrolledHScrolledCreateBackCreateScrollVCreateScrollHOnResizeOnVScrollShowOnVScrollHideOnHScrollShowOnHScrollHideOnScrollLineDownOnScrollLineUpOnScrollLineLeftOnScrollLineRightRebound OnVScrollShow The virtual handler of the VScroll (vertical scroll) dependent control "Show" (vertical scroll bar show) internal event. virtual bool OnVScrollShow() Return Value true - event processed, otherwise - false. Note The base class method does nothing and always returns true. OnResize OnVScrollHide