By default, the peers associated with all cells will be returned. To return only the peers for the cells in view (and assuming the System.Windows.Automation.ItemContainerPatternIdentifiers.Pattern is supported by the framework version being used) one can set this property to true.
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