The IsSelectionActive is used to indicate if keyboard focus is within the containing Infragistics.Controls.Editors.CalendarBase. This is often used to alter the appearance of a selected item when the control does not have keyboard focus (e.g. changing the selection color to gray when focus is outside the control).
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