System.Object
   C1.WPF.Menu.AngleConverter
   C1.WPF.Menu.ArcSegmentDef
   C1.WPF.Menu.C1ContextMenuService
   C1.WPF.Menu.DoubleToThicknessConverter
   C1.WPF.Menu.ExpandButtonTagConverter
   C1.WPF.Menu.OpacityConverter
   System.Windows.Threading.DispatcherObject
      System.Windows.DependencyObject
         System.Windows.Media.Visual
            System.Windows.UIElement
               System.Windows.FrameworkElement
                  System.Windows.Controls.Control
                     C1.WPF.Menu.C1MenuSeparator
                     System.Windows.Controls.ContentControl
                        C1.WPF.Menu.C1MenuScrollViewer
                     System.Windows.Controls.ItemsControl
                        C1.WPF.Core.C1ItemsControl
                           C1.WPF.Core.C1HierarchicalPresenter
                              C1.WPF.Menu.C1MenuItem
                              C1.WPF.Menu.C1MenuList
                                 C1.WPF.Menu.C1ContextMenu
                                 C1.WPF.Menu.C1Menu
                        C1.WPF.Menu.C1RadialBackgroundPresenter
                        C1.WPF.Menu.C1RadialColorItemsPresenter
                        C1.WPF.Menu.C1RadialMenu
                        C1.WPF.Menu.C1RadialMenuItem
                           C1.WPF.Menu.C1RadialColorItem
                           C1.WPF.Menu.C1RadialNumericItem
                        C1.WPF.Menu.C1RadialMenuItemsPresenter
                        C1.WPF.Menu.C1RadialSlider
                  System.Windows.Controls.Panel
                     C1.WPF.Menu.C1RadialPanel

Reference

C1.WPF.Menu Assembly