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