System.Object
   C1.Win.C1SpellChecker.CharRange
   C1.Win.C1SpellChecker.SpellDictionaryBase
      C1.Win.C1SpellChecker.SpellDictionary
      C1.Win.C1SpellChecker.UserDictionary
   C1.Win.C1SpellChecker.SpellOptions
   System.Collections.Generic.Dictionary<TKey,TValue>
      C1.Win.C1SpellChecker.WordDictionary
   System.Collections.Generic.List<T>
      C1.Win.C1SpellChecker.CharRangeList
      C1.Win.C1SpellChecker.SuggestionList
   System.Collections.ObjectModel.Collection<T>
      System.Collections.ObjectModel.KeyedCollection<TKey,TItem>
         C1.Win.C1SpellChecker.WordList
   System.EventArgs
      C1.Win.C1SpellChecker.AutoReplaceEventArgs
      C1.Win.C1SpellChecker.BadWordAddedEventArgs
      C1.Win.C1SpellChecker.BadWordEventArgs
      C1.Win.C1SpellChecker.ContextMenuEventArgs
      C1.Win.C1SpellChecker.SuggestionsEventArgs
   System.MarshalByRefObject
      System.ComponentModel.Component
         C1.Win.C1SpellChecker.C1SpellChecker
         System.Windows.Forms.Control
            System.Windows.Forms.ScrollableControl
               System.Windows.Forms.ContainerControl
                  System.Windows.Forms.Form
                     C1.Win.C1SpellChecker.C1SpellDialog

Reference

C1.Win.C1SpellChecker.4.8 Assembly