MQL5 ReferenceStandard LibraryPanels and DialogsCWndObjOnDestroy OnEventTextColorColorBackgroundColorBorderFontFontSizeZOrderOnObjectCreateOnObjectChangeOnObjectDeleteOnObjectDragOnSetTextOnSetColorOnSetColorBackgroundOnSetFontOnSetFontSizeOnSetZOrderOnDestroyOnChange OnDestroy The virtual handler of control "Destroy" internal event. virtual bool OnDestroy() Return Value true - event processed, otherwise - false. OnSetZOrder OnChange