Get: Returns true if this
Day object exists in the associated UltraCalendarInfo component's
UltraCalendarInfo.AlternateSelectedDateRanges collection. Set: Adds/removes this
Day object to/from the associated UltraCalendarInfo component's
UltraCalendarInfo.AlternateSelectedDateRanges collection.
Target Platforms: Windows 10, Windows 8.1, Windows 8, Windows 7, Windows Server 2012, 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