When the CalendarItem represents an item in the MinCalendarMode, the value of this property is equal to that of the IsSelected. This property is primarily intended to allow the control to display some indication to the end user that there are one or more dates within the item that are currently selected when they are in navigation mode.
Target Platforms: Windows 10, Windows 8.1, Windows 8, Windows 7, Windows Server 2012, 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