Using Infragistics WPF xamDataGrid, how do you add a child row to a parent row

Attached is a sample recorded and playback script of adding a row to an Infragistics xamDataGrid, then adding a child row. With the expected results of a parent row related to the child row.

The result of playback is Unable to find the object WPFObject("CellValuePresenter", "", 1).

The recording appears to be referencing the XamTextEditor cell of the parent row, and not the child row cell.

The object spy browser appears to also reference the same object.

Either  the CellValuePresenter or the XamTextEditor object is incorrect.

Regards

Bill Simpson