MQL5 ReferenceStandard LibraryPanels and DialogsCScrollOnHide CreateOnEventMinPosMaxPosCurrPosCreateBackCreateIncCreateDecCreateThumbOnClickIncOnClickDecOnShowOnHideOnChangePosOnThumbDragStartOnThumbDragProcessOnThumbDragEndCalcPos OnHide The virtual handler of the control "Hide" internal event. virtual bool OnHide() Return Value true - event processed, otherwise - false. OnShow OnChangePos