有没有一种方法可以使用bing地图在windows phone 8上手动移动调整图钉位置

我正在开发一个使用bing映射的windows phone 8.0应用程序。我想添加一个带有我当前位置的图钉。到目前为止太好了。我没办法做的就是移动那个大头针。更确切地说，我想点击那个大头针，然后把它移动到地图上的其他地方。

我尝试过ManipulationStarted、ManipulationDelta、ManipultionCompleted等事件和网络上的其他资源，但还没有结果。

我的C#代码：

public partial class MainPage : PhoneApplicationPage
    {
        Pushpin pin = new Pushpin();
        // Constructor
        public MainPage()
        {
            InitializeComponent();
            GetCurrentPosition();
        }
        async void GetCurrentPosition()
        {
        Geolocator geolocator = new Geolocator();
        geolocator.DesiredAccuracyInMeters = 50; 
        Geoposition geoposition = await geolocator.GetGeopositionAsync();
        Grid MyGrid = new Grid();
        MyGrid.RowDefinitions.Add(new RowDefinition());
        MyGrid.RowDefinitions.Add(new RowDefinition());
        MyGrid.Background = new SolidColorBrush(Colors.Transparent);            
        pin.Content = "I'm a pin";
        pin.Foreground = new SolidColorBrush(Colors.Purple);
        pin.ManipulationDelta += pin_ManipulationDelta;
        pin.ManipulationStarted += pin_ManipulationStarted;
        pin.ManipulationCompleted += pin_ManipulationCompleted;
        MyGrid.Children.Add(pin);
        //Creating a MapOverlay and adding the Grid to it.
        MapOverlay MyOverlay = new MapOverlay();
        MyOverlay.Content = MyGrid;
        MyOverlay.GeoCoordinate = new GeoCoordinate(geoposition.Coordinate.Latitude, geoposition.Coordinate.Longitude);
        MyOverlay.PositionOrigin = new Point(0, 0.5);
        MyMap.Center = new System.Device.Location.GeoCoordinate(geoposition.Coordinate.Latitude, geoposition.Coordinate.Longitude);
        MyMap.ZoomLevel = 16;
        MyMap.CartographicMode = Microsoft.Phone.Maps.Controls.MapCartographicMode.Road;
        MapLayer MyLayer = new MapLayer();
        MyLayer.Add(MyOverlay);
        MyMap.Layers.Add(MyLayer);
        translateTransform = new TranslateTransform();
    }
    void pin_ManipulationStarted(object sender, System.Windows.Input.ManipulationStartedEventArgs e)
    {
        //MessageBox.Show("started");
    }
    void pin_ManipulationDelta(object sender, System.Windows.Input.ManipulationDeltaEventArgs e)
    {
        MessageBox.Show("moving");
         //how do a get the coordonites while I'm moving the pin?
    }
    void pin_ManipulationCompleted(object sender, ManipulationCompletedEventArgs e)
    {
        MessageBox.Show("completed");
    }
}

阿比的想法如何使针可拖动？如果我设置pin。AllowDrop=true，则抛出NotImplementedException。

提前谢谢！