MQL5 ReferenceStandard LibraryPanels and DialogsCWndObjOnObjectChange OnEventTextColorColorBackgroundColorBorderFontFontSizeZOrderOnObjectCreateOnObjectChangeOnObjectDeleteOnObjectDragOnSetTextOnSetColorOnSetColorBackgroundOnSetFontOnSetFontSizeOnSetZOrderOnDestroyOnChange OnObjectChange The virtual handler of chart object CHARTEVENT_OBJECT_CHANGE event. virtual bool OnObjectChange() Return Value true - event processed, otherwise - false. OnObjectCreate OnObjectDelete