MQL5 ReferenceStandard LibraryPanels and DialogsCScrollCreateThumb CreateOnEventMinPosMaxPosCurrPosCreateBackCreateIncCreateDecCreateThumbOnClickIncOnClickDecOnShowOnHideOnChangePosOnThumbDragStartOnThumbDragProcessOnThumbDragEndCalcPos CreateThumb Creates thumb button (can be dragged) of CScroll control. virtual bool CreateThumb() Return Value true - successful, otherwise - false. CreateDec OnClickInc