Silverlight Windows Phone 7 ItemsControl数据绑定

我正在开发WP7的应用程序。我有一个对象集合，每个对象都有一些属性，我们需要在屏幕上显示。我很抱歉，但要真正解释它，这将是大量的代码。

MyGrouping类:

public class MyListGrouping : INotifyPropertyChanged
{
    public MyListGrouping( )
    {
        _Title = "";
        _Group = new ObservableCollection<MyList>( );
    }
    private string _Title;
    public string Title
    {
        get { return _Title; }
        set
        {
            _Title = value;
            NotifyPropertyChanged( "Title" );
        }
    }
    private ObservableCollection<MyList> _Group;
    public ObservableCollection<MyList> Group
    {
        get { return _Group; }
        set
        {
            _Group = value;
            NotifyPropertyChanged( "Group" );
        }
    }

    public event PropertyChangedEventHandler PropertyChanged;
    public void NotifyPropertyChanged( string propertyName )
    {
        if ( PropertyChanged != null )
            PropertyChanged( this, new PropertyChangedEventArgs( propertyName ) );
    }
}

MyList类:

public class MyList : INotifyPropertyChanged
{
    public MyList( ){}
    private string _DisplayName;
    public string DisplayName
    {
        get{return _DisplayName;}
        set
        {
            _DisplayName = value;
            NotifyPropertyChanged( "DisplayName" );
        }
    }
    public event PropertyChangedEventHandler PropertyChanged;
    public void NotifyPropertyChanged( string propertyName )
    {
        if ( PropertyChanged != null )
            PropertyChanged( this, new PropertyChangedEventArgs( propertyName ) );
    }
}

现在是两个独立的用户控件在Silverlight。

    <ScrollViewer VerticalScrollBarVisibility="Auto">
    <ItemsControl x:Name="ItemContainer" ItemsSource="{Binding Path=ListGroups}" >
        <ItemsControl.ItemTemplate>
            <DataTemplate>
                <StackPanel Orientation="Vertical" Margin="0,5,0,0">
                    <!--Only works if we don't bind here for some reason-->
                    <base:MyListView ListGroup="{Binding Group}" Title="{Binding Title}" />
                </StackPanel>
            </DataTemplate>
        </ItemsControl.ItemTemplate>
    </ItemsControl>
</ScrollViewer>
    public partial class MyListGroupingView : UserControl
{
    public static readonly DependencyProperty ListGroupsProperty = DependencyProperty.Register( "ListGroups", typeof( ObservableCollection<MyListGrouping> ), typeof( MyListGroupingView ), new PropertyMetadata( null ) );
    public MyListGroupingView( )
    {
        InitializeComponent( );
        this.DataContext = this;
    }
    public ObservableCollection<MyListGrouping> ListGroups
    {
        get { return (ObservableCollection<MyListGrouping>)GetValue( ListGroupsProperty ); }
        set { SetValue( ListGroupsProperty, value ); }
    }
    private void UserControl_Loaded( object sender, RoutedEventArgs e )
    {
        MyListGrouping aList = new MyListGrouping( ) { Title = "A" };
        aList.Group.Add( new MyList( ) { DisplayName = "Ant" } );
        aList.Group.Add( new MyList( ) { DisplayName = "Art" } );
        MyListGrouping bList = new MyListGrouping( ) { Title = "B" };
        bList.Group.Add( new MyList( ) { DisplayName = "Bob" } );
        bList.Group.Add( new MyList( ) { DisplayName = "Billy" } );
        ObservableCollection<MyListGrouping> collection = new ObservableCollection<MyListGrouping>( );
        collection.Add( aList );
        collection.Add( bList );
        ListGroups = collection;
    }
}

和它使用的UI元素:

    <Grid x:Name="LayoutRoot">
    <Grid.RowDefinitions>
        <RowDefinition Height="20*"/>
        <RowDefinition Height="80*"/>
    </Grid.RowDefinitions>
    <Grid.ColumnDefinitions>
        <ColumnDefinition Width="30*"/>
        <ColumnDefinition Width="70*"/>
    </Grid.ColumnDefinitions>
    <Button x:Name="SectionLetterBtn" Content="{Binding Path=EntityGroup.StartingText}" Background="{StaticResource PhoneAccentBrush}" Foreground="{StaticResource PhoneForegroundBrush}" BorderBrush="Transparent" Grid.Column="0" Grid.Row="0" />
    <ScrollViewer VerticalScrollBarVisibility="Auto" Grid.Row="1" Grid.Column="0" Grid.ColumnSpan="2">
        <ItemsControl x:Name="ItemContainer" ItemsSource="{Binding Path=EntityGroup.Group}">
            <ItemsControl.ItemTemplate>
                <DataTemplate>
                    <Grid>
                        <Grid.ColumnDefinitions>
                            <ColumnDefinition Width="20*" />
                            <ColumnDefinition Width="80*" />
                        </Grid.ColumnDefinitions>
                        <TextBlock Text="{Binding DisplayName}" Grid.Column="1" />
                    </Grid>
                </DataTemplate>
            </ItemsControl.ItemTemplate>
        </ItemsControl>
    </ScrollViewer>
</Grid>
    public partial class MyListView : UserControl
{
    public static readonly DependencyProperty TitleProperty = DependencyProperty.Register( "Title", typeof( string ), typeof( MyListView ), new PropertyMetadata( null ) );
    public static readonly DependencyProperty ListGroupProperty = DependencyProperty.Register( "ListGroup", typeof( ObservableCollection<MyList> ), typeof( MyListView ), new PropertyMetadata( null ) );
    public MyListView( )
    {
        InitializeComponent( );
        this.DataContext = this;
    }
    public ObservableCollection<MyList> ListGroup
    {
        get { return (ObservableCollection<MyList>)GetValue( ListGroupProperty ); }
        set { SetValue( ListGroupProperty, value ); }
    }
    public string Title
    {
        get { return (string)GetValue( TitleProperty ); }
        set { SetValue( TitleProperty, value ); }
    }
}

我遇到的问题是，我会看到2个按钮显示，但他们是空的。我只看到两个蓝色的按钮。我确信我在代码中遗漏了一些愚蠢的东西，但根本找不到它。

对此有什么想法吗?我对数据绑定还是个新手，在一些实现细节上遇到了麻烦。任何帮助都会很好。提前感谢。