在Silverlight中从ItemDragEventArgs获取目标点

ItemDragEventArgs

Microsoft.Windows.DragEventArgs e

<toolkit:PanelDragDropTarget AllowDrop=\"True\" ItemDroppedOnTarget=\"DragAndDrop_ItemDroppedOnTarget\">

private void DragAndDrop_ItemDroppedOnTarget(object sender, ItemDragEventArgs e)
{
   // how to get the destination Point here??
}

private Point _releasePoint;

public Grid()
{
   Grid.MouseLeftButtonUp += new MouseButtonEventHandler(Grid_MouseLeftButtonUp);
}

void Grid_MouseLeftButtonUp(object sender, MouseButtonEventArgs e)
{
   _releasePoint = e.GetPosition(Grid);
}

private void DragAndDrop_ItemDroppedOnTarget(object sender, ItemDragEventArgs e)
{
   // fires next and _releasePoint is already set
}