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