Bind and display hierarchically data

Hi There,

I have a similar requirement to display data hierarchically, but not from Observable Collection, from Data Set. Here is the sample code,

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public partial class MainWindow : Window
{
   public MainWindow()
   {
       InitializeComponent();
       DataSet data = LoadData();
       //DataContext = data;
   }

   private DataSet LoadData()
   {
       DataSet ds = new DataSet("Account");

       DataTable root = new DataTable("root");
       root.Columns.Add("accountId");
       root.Columns.Add("field1");
       root.Columns.Add("field2");
       root.Columns.Add("field3");

       DataTable child = new DataTable("child");
       child.Columns.Add("id");
       child.Columns.Add("detail1");
       child.Columns.Add("detail2");

       ds.Tables.Add(root);
       ds.Tables.Add(child);

       ds.Relations.Add(new DataRelation("ParentChile", root.Columns["accountId"], child.Columns["id"], false));

       root.Rows.Add("a", "a1", "a2", "a3");
       root.Rows.Add("b", "b1", "b2", "b3");
       root.Rows.Add("c", "c1", "c2", "c3");

       child.Rows.Add("a", "da1", "da2");
       child.Rows.Add("a", "da12", "da22");
       child.Rows.Add("a", "da13", "da23");

       child.Rows.Add("b", "db1", "db2");
       child.Rows.Add("b", "db12", "db22");
       child.Rows.Add("b", "db13", "db23");

       return ds;
   }
}

--------------------------------

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Please advise.

Thanking you in advance for your help.