MQL5 ReferenceStandard LibraryPanels and DialogsCScrollOnClickDec CreateOnEventMinPosMaxPosCurrPosCreateBackCreateIncCreateDecCreateThumbOnClickIncOnClickDecOnShowOnHideOnChangePosOnThumbDragStartOnThumbDragProcessOnThumbDragEndCalcPos OnClickDec The virtual handler of the control "ClickDec" (left mouse button click on the decrement button) internal event. virtual bool OnClickDec() Return Value true - event processed, otherwise - false. OnClickInc OnShow