<igDP:XamDataGrid xmlns:igDP="http://infragistics.com/DataPresenter"
  Name="gridFields"
                  GroupByAreaLocation="None"
                  DataSource="{Binding Class1View}"
                  Grid.Row="2"
                  AutoFit="True"
                  IsSynchronizedWithCurrentItem="True">
  <igDP:XamDataGrid.FieldLayouts>
    <igDP:FieldLayout>
      <igDP:FieldLayout.Fields>
        <igDP:Field Name="Name" Label="Field"/>         
        <igDP:Field Name="Class2View"/>
      </igDP:FieldLayout.Fields>
    </igDP:FieldLayout>
    <igDP:FieldLayout>
      <igDP:FieldLayout.Settings>
        <igDP:FieldLayoutSettings LabelLocation="Hidden" />
      </igDP:FieldLayout.Settings>
      <igDP:FieldLayout.Fields>
        <igDP:Field Name="Name"/>
      </igDP:FieldLayout.Fields>
    </igDP:FieldLayout>
  </igDP:XamDataGrid.FieldLayouts>
  <igDP:XamDataGrid.FieldLayoutSettings>
    <igDP:FieldLayoutSettings AutoGenerateFields="False" AllowAddNew="False" AllowDelete="False" AllowFieldMoving="No" />
  </igDP:XamDataGrid.FieldLayoutSettings>
</igDP:XamDataGrid>

public class Class1 {
    ...
    public Class1() {

           m_class2View = new ListCollectionView(...);
    }
    public string Name { get; set; }
    public ListCollectionView Class2View { get { return m_class2View; } }
}

public class Class1 {
    ...
    public Class1() {

           m_class2View = new ListCollectionView(...);
    }
    public string Name { get; set; }
    public ListCollectionView Class2View { get { return m_class2View; } }
}

public class Class2 {
    ...
    public Class2() {
        m_class3View = new ListCollectionView(...);
    }

    public string Name { get; set; }
}

Given something along the lines of above (where Class1View also is a ListCollectionView), it seems that CurrentItem of List1View is updated as expected, however Class2View.CurrentItem always seem to remain null.

Is there something additional that needs to be done to allow it to work also at the second level?

I'm using 9.1 version