Specifying this property as SimpleFillSymbol, you have a possibility to highlight separately an interior or border of graphic or both interior and border. If the Fill property is specified, the interior will be highlighted with the given fill brush. If not, the interior remains unchanged. If the BorderBrush property is specified, the border will be highlighted with the given border brush and border thickness. If not, the border remains unchanged.

This behavior is implemented with the MakeHighlightSymbol method and can be overriden in derived classes.

Target Platforms: Windows 98, Windows NT 4.0, Windows Millennium Edition, Windows 2000, Windows XP Home Edition, Windows XP Professional, Windows Server 2003 family, Windows Vista, Windows Server 2008 family

Reference