Hello Daniel,

Thank you for your feedback. I am glad that you resolved your issue and I believe that other community members may benefit from this as well.

Thanks again.

Thanks for the response Stefan.  In the meantime, I figured the following workaround (not ideal, but it meets my requirements for now).

For the types that do not exist, I add a dummy record of that type and tag it.  Then, I set the Visibility of the dummy datarecords to Collapsed in the DRPloaded event.  Here is some rough code for the user community:

private void DRPloaded(object sender, RoutedEventArgs e) {

   // Hide dummy records.
   foreach (object o in (sender as DataRecordPresenter).DataPresenter.Records) {
      recursiveHideDummy(o);
   }

}

private void recursiveHideDummy(object o) {
        if (o is GroupByRecord) {
            foreach (object o1 in (o as GroupByRecord).ChildRecords) {
                recursiveHideDummy(o1);
            }
        } else if (o is DataRecord) {
            if ((o as DataRecord).DataItem is CustomType1) {
                if (((o as DataRecord).DataItem as CustomType1).Tag == "DUMMY") {
                    (o as DataRecord).Visibility = Visibility.Collapsed;
                }
            }
        }
    }