Hello,

I try providing custom SortComparer that doesn't help much.

However by handling Sorting and CellUpdated event together I am able to work around with this issue. (please see below code - I had to initialize the SortCol to MaxValue for it to be at the bottom when ascending with blank rows)

Does this make sense or a better approach is available in 2010.03.

Also it would be great if we get notified when a record been included for sorting so we can invalidate that if the record is not a vaild one for sorting. That would eliminate this approach of adding new column and handling cell updated event which I am not confortable with it as I think handling cell update just for this impact any performance?

Any thoughts?

         private void XamDataGrid1Sorting(object sender, Infragistics.Windows.DataPresenter.Events.SortingEventArgs e)
        {
            if (e.SortDescription != null && e.SortDescription.Direction == ListSortDirection.Ascending)
            {
                e.Cancel = true;

                e.FieldLayout.SortedFields.Clear();

                e.FieldLayout.SortedFields.Add(new FieldSortDescription("SortCol", e.SortDescription.Direction,
                                                                        false));

                e.FieldLayout.SortedFields.Add(new FieldSortDescription(e.SortDescription.FieldName,
                                                                        e.SortDescription.Direction,
                                                                        e.SortDescription.IsGroupBy));
            }
        }

        private void xamDataGrid1_CellUpdated(object sender, Infragistics.Windows.DataPresenter.Events.CellUpdatedEventArgs e)
        {
            var testViewModel = e.Cell.Record.DataItem as TestViewModel;

            if (testViewModel != null && testViewModel.SortCol != int.MinValue)
                testViewModel.SortCol = int.MinValue;
        }