How to Bind wpf DataGridComboBoxColumn？？？

Bind a List to the ItemsSource of the DataGridComboBoxColumn and then specify the SelectedItemBinding, DisplayMemberPath, SelectedValueBinding or the SelectedValuePath property.

Below is sample code from social.msdn site:

XAML:

    <DataGrid AutoGenerateColumns="False" Height="200" HorizontalAlignment="Left" Name="dataGrid1" VerticalAlignment="Top" Width="308">
      <DataGrid.Columns>
        <DataGridTextColumn Header="Name" Binding="{Binding Name}"/>
        <DataGridComboBoxColumn x:Name="ComboBoxColumn" Header="Position"  SelectedItemBinding="{Binding Position}"/>
      </DataGrid.Columns>
    </DataGrid>

Code:

public partial class MainWindow : Window
  {
    public ObservableCollection<Player> Players { get; set; }
    public ObservableCollection<string> Positions { get; set; }
    public MainWindow()
    {
      Positions = new ObservableCollection<string>() { "Forward", "Defense", "Goalie" };
      Players = new ObservableCollection<Player>(){
                    new Player() {Name = "Tom",Position= "Forward"},
                    new Player() {Name = "Dick", Position= "Defense"},
                    new Player() {Name = "Harry", Position= "Goalie"}
      };
      InitializeComponent();
      ComboBoxColumn.ItemsSource = Positions;
      dataGrid1.ItemsSource = Players;
    }
  }

  public class Player
  {
    public string Name { set; get; }
    public string Position { set; get; }
  }