MQL5 ReferenceStandard LibraryPanels and DialogsCRadioGroupOnScrollLineDown CreateOnEventAddItemValueCreateButtonOnVScrollShowOnVScrollHideOnScrollLineDownOnScrollLineUpOnChangeItemRedrawRowStateSelect OnScrollLineDown The virtual handler of the dependent VScroll (vertical scroll) control "ScrollLineDown" internal event. virtual bool OnScrollLineDown() Return Value true - event processed, otherwise - false. OnVScrollHide OnScrollLineUp