MQL5 ReferenceStandard LibraryPanels and DialogsCRadioGroupOnVScrollShow CreateOnEventAddItemValueCreateButtonOnVScrollShowOnVScrollHideOnScrollLineDownOnScrollLineUpOnChangeItemRedrawRowStateSelect OnVScrollShow The virtual handler of the dependent VScroll (vertical scroll) control "Show" internal event. virtual bool OnVScrollShow() Return Value true - event processed, otherwise - false. CreateButton OnVScrollHide