ArcGISWindowsPhoneSDK.QueryRelatedRecords.SelectedWellsTreeView_OnSelectionChanged C# (CSharp) Method

        private void SelectedWellsTreeView_OnSelectionChanged(object sender, System.Windows.Controls.SelectionChangedEventArgs e)
        {
            if (e.RemovedItems.Count > 0)
            {
                Graphic g = e.RemovedItems[0] as Graphic;
                g.UnSelect();
                g.SetZIndex(0);
            }

            if (e.AddedItems.Count > 0)
            {
                Graphic g = e.AddedItems[0] as Graphic;
                g.Select();
                g.SetZIndex(1);

                //Relationship query
                RelationshipParameter relationshipParameters = new RelationshipParameter()
                {
                    ObjectIds = new int[] { Convert.ToInt32(g.Attributes[SelectedWellsTreeView.Tag as string]) },
                    OutFields = new string[] { "OBJECTID, API_NUMBER, ELEVATION, FORMATION, TOP" },
                    RelationshipId = 3,
                    OutSpatialReference = MyMap.SpatialReference
                };

                queryTask.ExecuteRelationshipQueryAsync(relationshipParameters);
            }
        }