When expanded this will, in most cases, return a RecordListControl containing the Record's Record.ViewableChildRecords. However, for ExpandableFieldRecordPresenters, if the associated Field's DataType does not implement the System.Collections.IEnumerable interface then the nested content will contain an ExpandedCellPresenter with the actual value of the Cell.
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