MQL5 ReferenceStandard LibraryPanels and DialogsCPanelOnSetColorBackground CreateBorderTypeOnSetTextOnSetColorBackgroundOnSetColorBorderOnCreateOnShowOnHideOnMoveOnResizeOnChange OnSetColorBackground The virtual handler of control "SetColorBackground" (change of the OBJPROP_BGCOLOR property) event. virtual bool OnSetColorBackground() Return Value true - event processed, otherwise - false. OnSetText OnSetColorBorder