System.Object
   C1.DataCollection.C1DelegateList<T>
      C1.WPF.Ribbon.ToolStripOverflowItemsCollection
   C1.WPF.Ribbon.RibbonGroupSizeDefinition
   C1.WPF.Ribbon.RibbonToolSizeDefinition
   C1.WPF.Ribbon.ToolTemplateSettings
   System.Collections.ObjectModel.Collection<T>
      System.Collections.ObjectModel.ObservableCollection<T>
         C1.WPF.Ribbon.MenuToolCollection
         C1.WPF.Ribbon.RibbonGroupSizeDefinitionCollection
         C1.WPF.Ribbon.RibbonToolSizeDefinitionCollection
   System.Windows.Threading.DispatcherObject
      System.Windows.DependencyObject
         System.Windows.Media.Visual
            System.Windows.UIElement
               System.Windows.FrameworkElement
                  System.Windows.Controls.Control
                     C1.WPF.Core.C1View
                        C1.WPF.Ribbon.C1Tool
                           C1.WPF.Ribbon.C1ButtonTool
                           C1.WPF.Ribbon.C1ContentControlTool
                           C1.WPF.Ribbon.C1DropDownTool
                              C1.WPF.Ribbon.C1MenuTool
                           C1.WPF.Ribbon.C1SelectTool
                           C1.WPF.Ribbon.C1ToggleButtonTool
                     C1.WPF.Ribbon.C1ToolSeparator
                     System.Windows.Controls.ContentControl
                        C1.WPF.TabControl.C1TabItem
                           C1.WPF.Ribbon.RibbonTabItem
                     System.Windows.Controls.ItemsControl
                        C1.WPF.Core.C1ItemsControl
                           C1.WPF.Core.C1HierarchicalPresenter
                              C1.WPF.Menu.C1MenuItem
                                 C1.WPF.Ribbon.ToolMenuItem
                                    C1.WPF.Ribbon.DropDownToolMenuItem
                              C1.WPF.Menu.C1MenuList
                                 C1.WPF.Ribbon.ToolMenuList
                           C1.WPF.TabControl.C1TabControl
                              C1.WPF.Ribbon.C1Ribbon
                        C1.WPF.Ribbon.C1ToolStrip
                        C1.WPF.Ribbon.RibbonGroup
                  System.Windows.Controls.Panel
                     C1.WPF.Ribbon.RibbonGroupPanel
                     C1.WPF.Ribbon.RibbonPanel
                     System.Windows.Controls.VirtualizingPanel
                        C1.WPF.Ribbon.ToolStripPanel

Reference

C1.WPF.Ribbon Assembly