System.Object
   C1.Xaml.OrgChart.DataTemplateSelector
   System.MarshalByRefObject
      System.__ComObject
         System.Runtime.InteropServices.WindowsRuntime.RuntimeClass
            Windows.UI.Xaml.DependencyObject
               Windows.UI.Xaml.FrameworkTemplate
                  Windows.UI.Xaml.DataTemplate
                     C1.Xaml.OrgChart.HierarchicalDataTemplate
               Windows.UI.Xaml.UIElement
                  Windows.UI.Xaml.FrameworkElement
                     Windows.UI.Xaml.Controls.Control
                        Windows.UI.Xaml.Controls.ItemsControl
                           C1.Xaml.OrgChart.C1OrgChart

Reference

C1.UWP.OrgChart Assembly