Note: this can be different than the index in the Infragistics.Controls.Layouts.XamTileManager's Items collection if the item was swapped with another item by a user drag operation.
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