Can be None, Raised or Sunken. The inner bevel is rendered using the InnerLight
and InnerDark colors of the StandardFrame object. Initially these colors are
set to KnownColor.Control and KnownColor.ControlDarkDark respectively.
Target Platforms: Windows 7, Windows Vista SP1 or later, Windows XP SP3, Windows Server 2008 (Server Core not supported), Windows Server 2008 R2 (Server Core supported with SP1 or later), Windows Server 2003 SP2