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