Windows 8 Live Hub Tile

我正在使用 Callisto Toolkit 在 Windows 8 应用程序中创建动态中心磁贴，但我无法为我的动态磁贴执行数据绑定。我使用的代码如下：

<callisto:LiveTile x:Name="liveTile2" 
            Background="#3B5998"
            ItemsSource="{Binding Tile}"
            Grid.Column="5"
            Grid.Row="1"
            Height="250"
            VerticalAlignment="Top"
            BorderBrush="White" BorderThickness="1"
            Margin="5" 
            Direction="Up">
            <callisto:LiveTile.ItemTemplate>
                <DataTemplate>
                    <Grid Margin="5">
                        <Grid.DataContext>
                            <ViewModel:Tile/>
                        </Grid.DataContext>
                        <Grid.RowDefinitions>
                            <RowDefinition Height="Auto" />
                            <RowDefinition Height="*" />
                            <RowDefinition Height="Auto" />
                        </Grid.RowDefinitions>
                        <Image x:Name="tileImage" Source="{Binding Image}"/>

                        <TextBlock Foreground="White"
                            TextWrapping="Wrap"
                            TextTrimming="WordEllipsis" 
                            FontSize="14"
                            Grid.Row="1" Margin="0,71,0,0" Text="{Binding Msg}" />

                    </Grid>
                </DataTemplate>
            </callisto:LiveTile.ItemTemplate>
            <callisto:LiveTile.DataContext>
                <ViewModel:LiveTileData/>
            </callisto:LiveTile.DataContext>
        </callisto:LiveTile>

这是磁贴的类：

namespace Test.ViewModel
{
    public class Tile
    {
        public string Msg { get; set; }
        public Uri Image { get; set; }
    }
    public class LiveTileData
    {
        private static ObservableCollection<Tile> tileData = new ObservableCollection<Tile>();
        public static ObservableCollection<Tile> TileData
        {
            get
            {
                return tileData;
            }
        }
    }
}