System.Object
   System.Exception
      System.ApplicationException
         Xceed.DockingWindows.DockingWindowsException
            Xceed.DockingWindows.DockingWindowsInternalException
   System.MarshalByRefObject
      System.ComponentModel.Component
         System.Windows.Forms.Control
            System.Windows.Forms.ScrollableControl
               System.Windows.Forms.ContainerControl
                  System.Windows.Forms.UserControl
                     Xceed.DockingWindows.ToolWindow
         Xceed.DockingWindows.DockLayoutManager
   Xceed.DockingWindows.AutoHideFrameAppearance
   Xceed.DockingWindows.CaptionAppearance
   Xceed.DockingWindows.Licenser
   Xceed.DockingWindows.TabStripAppearance
   Xceed.DockingWindows.ToolWindowGroup
   Xceed.Utils.Collections.ListBase
      Xceed.DockingWindows.ReadOnlyToolWindowCollection
         Xceed.DockingWindows.ToolWindowCollection

Reference

Xceed.DockingWindows.v2.3 Assembly