System.Object
   System.ComponentModel.CustomTypeDescriptor
      Xceed.Wpf.Toolkit.Core.EditableKeyValuePair<TKey,TValue>
   System.ComponentModel.TypeConverter
      System.ComponentModel.EnumConverter
         Xceed.Wpf.Toolkit.Core.EnumDisplayNameConverter
   System.EventArgs
      System.Windows.RoutedEventArgs
         System.Windows.Controls.Primitives.DragDeltaEventArgs
            Xceed.Wpf.Toolkit.Core.WindowResizeDragEventArgs
         Xceed.Wpf.Toolkit.Core.CancelRoutedEventArgs
            Xceed.Wpf.Toolkit.ItemAddingEventArgs
            Xceed.Wpf.Toolkit.ItemDeletingEventArgs
         Xceed.Wpf.Toolkit.Core.PropertyChangedEventArgs<T>
            Xceed.Wpf.Toolkit.Core.IndexChangedEventArgs
            Xceed.Wpf.Toolkit.Zoombox.ZoomboxViewChangedEventArgs
      Xceed.Wpf.Toolkit.Core.QueryTextFromValueEventArgs
      Xceed.Wpf.Toolkit.Core.QueryValueFromTextEventArgs
   System.Exception
      Xceed.Wpf.Toolkit.Core.InvalidContentException
      Xceed.Wpf.Toolkit.Core.InvalidTemplateException
   System.Windows.Markup.MarkupExtension
      Xceed.Wpf.Toolkit.Core.PackUriExtension
         Xceed.Wpf.Toolkit.Core.ImageUriExtension
   System.Windows.ResourceDictionary
      Xceed.Wpf.Toolkit.Core.ResourceDictionary
         Xceed.Wpf.Toolkit.Core.VersionResourceDictionary
   System.Windows.Threading.DispatcherObject
      System.Windows.DependencyObject
         System.Windows.Media.Visual
            System.Windows.UIElement
               System.Windows.FrameworkElement
                  System.Windows.Controls.TextBlock
                     Xceed.Wpf.Toolkit.Core.GenericTextBlock

Reference

Xceed.Wpf.Toolkit Assembly