Windows.UI.Xaml.DragEventArgs.GetPosition C# (CSharp) Method

		public extern Point GetPosition([In] UIElement relativeTo);
	}

        private void OnTabStripDrop(object sender, Windows.UI.Xaml.DragEventArgs e)
        {
            // This event is called when we're dragging between different TabViews
            // It is responsible for handling the drop of the item into the second TabView

            object obj;
            object objOriginTabView;

            if (e.DataView.Properties.TryGetValue(DataIdentifier, out obj) && e.DataView.Properties.TryGetValue(DataTabView, out objOriginTabView))
            {
                // TODO - BUG: obj should never be null, but occassionally is. Why?
                if (obj == null || objOriginTabView == null)
                {
                    return;
                }

                var originTabView      = objOriginTabView as TabView;
                var destinationTabView = sender as TabView;
                var destinationItems   = destinationTabView.TabItems;
                var tabViewItem        = obj as TabViewItem;

                if (destinationItems != null)
                {
                    // First we need to get the position in the List to drop to
                    var index = -1;

                    // Determine which items in the list our pointer is inbetween.
                    for (int i = 0; i < destinationTabView.TabItems.Count; i++)
                    {
                        var item = destinationTabView.ContainerFromIndex(i) as TabViewItem;

                        if (e.GetPosition(item).X - item.ActualWidth < 0)
                        {
                            index = i;
                            break;
                        }
                    }

                    // Remove item from the old TabView
                    originTabView.TabItems.Remove(tabViewItem);

                    if (index < 0)
                    {
                        // We didn't find a transition point, so we're at the end of the list
                        destinationItems.Add(tabViewItem);
                    }
                    else if (index < destinationTabView.TabItems.Count)
                    {
                        // Otherwise, insert at the provided index.
                        destinationItems.Insert(index, tabViewItem);
                    }

                    // Select the newly dragged tab
                    destinationTabView.SelectedItem = tabViewItem;
                }
            }
        }