System.Object
   C1.WPF.TabControl.C1SlopedBorderAdjustConverter
   C1.WPF.TabControl.C1TabItemBorderClipConverter
   System.EventArgs
      System.ComponentModel.CancelEventArgs
         C1.WPF.TabControl.CancelSourceEventArgs
   System.Windows.Threading.DispatcherObject
      System.Windows.DependencyObject
         System.Windows.Media.Visual
            System.Windows.UIElement
               System.Windows.FrameworkElement
                  System.Windows.Controls.Control
                     System.Windows.Controls.ContentControl
                        C1.WPF.Core.C1ContentControl
                           C1.WPF.TabControl.C1TabItemBorder
                           C1.WPF.TabControl.C1TabItemPresenter
                        C1.WPF.TabControl.C1TabItem
                     System.Windows.Controls.ItemsControl
                        C1.WPF.Core.C1ItemsControl
                           C1.WPF.TabControl.C1TabControl
                  System.Windows.Controls.Panel
                     C1.WPF.TabControl.C1TabPanel

Reference

C1.WPF.TabControl Assembly