add menu item to default context menu

I'd like to add a menu item to the default ContextMenu of a RichTextBox. I can create a new context menu but then I loose the spell check suggestions that show up in the default menu. Is there a way to add an item without re-implementing everything?

From stackoverflow dmo

• It's not too tricky to reimplement the RichTextBox context menu with spelling suggestions, Cut, Paste, etc.

  Hook up the context menu opening event as follows:

  AddHandler(RichTextBox.ContextMenuOpeningEvent, new ContextMenuEventHandler(RichTextBox_ContextMenuOpening), true);
  

  Within the event handler build the context menu as you need. You can recreate the existing context menu menu items with the following:

  private IList<MenuItem> GetSpellingSuggestions()
  {
      List<MenuItem> spellingSuggestions = new List();
      SpellingError spellingError = myRichTextBox.GetSpellingError(myRichTextBox.CaretPosition);
      if (spellingError != null)
      {
       foreach (string str in spellingError.Suggestions)
       {
        MenuItem mi = new MenuItem();
        mi.Header = str;
        mi.FontWeight = FontWeights.Bold;
        mi.Command = EditingCommands.CorrectSpellingError;
        mi.CommandParameter = str;
        mi.CommandTarget = myRichTextBox;
        spellingSuggestions.Add(mi);
       }
      }
      return spellingSuggestions;
  }
  
  private IList<MenuItem> GetStandardCommands()
  {
      List<MenuItem> standardCommands = new List();
  
      MenuItem item = new MenuItem();
      item.Command = ApplicationCommands.Cut;
      standardCommands.Add(item);
  
      item = new MenuItem();
      item.Command = ApplicationCommands.Copy;
      standardCommands.Add(item);
  
      item = new MenuItem();
      item.Command = ApplicationCommands.Paste;
      standardCommands.Add(item);
  
      return standardCommands;
  }
  

  If there are spelling errors, you can create Ignore All with:

  MenuItem ignoreAllMI = new MenuItem();
  ignoreAllMI.Header = "Ignore All";
  ignoreAllMI.Command = EditingCommands.IgnoreSpellingError;
  ignoreAllMI.CommandTarget = textBox;
  newContextMenu.Items.Add(ignoreAllMI);
  

  Add separators as required. Add those to the new context menu's items, and then add your shiny new MenuItems.

  I'm going to keep looking for a way to obtain the actual context menu though, as this is relevant to something I'll be working on in the near future.

  dmo : Thanks, Donnelle. I figured it would probably come to re-implementing. Thanks for the tips on how to do this!
  From Donnelle