InfoPath Dev

I have a form with a repeating section which contains a repeating section of its own. I would like to sort the form based on the field in the outer section, which worked until I made the other controls part of a repeating subsection.

I uploaded an image of the nested sections to help visualize the data (below).

Here is the code that worked before adding the repeating subsection:

        private void SortRepeatingTable(string fieldName)
        {
            XPathNavigator mainDS = MainDataSource.CreateNavigator();
            XPathNavigator aritems = mainDS.SelectSingleNode(
              "/my:myFields/my:ARItems", NamespaceManager);
            XmlReader reader = aritems.ReadSubtree();

            DataSet ds = new DataSet();
            ds.ReadXml(reader);

            DataTable sortedTable = new DataTable();

            if (ds.Tables != null && ds.Tables.Count > 0)
            {
                DataTable dt = ds.Tables[0];
                sortedTable = dt.Copy();
                sortedTable.Clear();

                DataRow[] rows = dt.Select("", fieldName + " ASC");

                foreach (DataRow row in rows)
                {
                    sortedTable.Rows.Add(row.ItemArray);
                }
            }

            ds.Tables.Clear();
            ds.Tables.Add(sortedTable);

            using (MemoryStream ms = new MemoryStream())
            {
                ds.WriteXml(ms);

                ms.Position = 0;
                XPathDocument doc = new XPathDocument(ms);
                aritems.ReplaceSelf(doc.CreateNavigator());

                ms.Close();
            }
        }

 Somehow I can't make the leap to taking my nested section along when I move the outer containers around. I would appreciate any ideas on this.

This was eventually solved

 Wonderful - sorry no one had any suggestions / help for you. I'm glad you got it sorted. Care to post your solution?