New Post: Synchronizing with the Grid

<StackPanel>
      <xcdg:DataGridControl x:Name="_datagrid" />
      <Button Content="Refresh"
              Click="Button_Click" />
</StackPanel>

  public partial class MainWindow : Window
  {
    List<MyData> _theList = new List<MyData>()
                            {
                              new MyData() { Age = 22, FirstName = "Tom", LastName = "Tompson"},
                              new MyData() { Age = 45, FirstName = "Mark", LastName = "Jones"},
                              new MyData() { Age = 63, FirstName = "Karen", LastName = "Bartley"},
                              new MyData() { Age = 55, FirstName = "Julia", LastName = "Lapson"},
                              new MyData() { Age = 31, FirstName = "Mike", LastName = "Mouse"},
                            };

    MyData _newItem = new MyData() { Age = 25, FirstName = "Angelina", LastName = "Sawyer"};

    public MainWindow()
    {
      InitializeComponent();

      _datagrid.ItemsSource = _theList;
    }

    private void Button_Click( object sender, RoutedEventArgs e )
    {
      _theList.Add( _newItem );
      _datagrid.Items.Refresh();

      DependencyObject dependencyObject = _datagrid.GetContainerFromItem( _newItem );
      if( dependencyObject == null )
      {
        System.Diagnostics.Debug.WriteLine( "Container is null at this point" );

        _datagrid.LayoutUpdated += this.Datagrid_LayoutUpdated;
      }
    }

    private void Datagrid_LayoutUpdated( object sender, EventArgs e )
    {
      DataRow dataRow = _datagrid.GetContainerFromItem( _newItem ) as DataRow;
      if( dataRow != null )
      {
        DataCell dataCell = dataRow.Cells[ "Age" ] as DataCell;
        if( dataCell != null )
        {
          System.Diagnostics.Debug.WriteLine( "Background of DataCell is : " + dataCell.Background.ToString() );
        }
      }

      _datagrid.LayoutUpdated -= this.Datagrid_LayoutUpdated;
    }
  }

  public class MyData
  {
    public string FirstName
    {
      get;
      set;
    }

    public string LastName
    {
      get;
      set;
    }

    public int Age
    {
      get;
      set;
    }
  }