/// <summary>
 /// Remove the specified editor from the list.
 /// </summary>
 public static void Remove(CIXMessageEditor editor)
 {
     if (_modelessList != null)
     {
         _modelessList.Remove(editor);
     }
 }
 /// <summary>
 /// Add the specified editor to the list.
 /// </summary>
 public static void Add(CIXMessageEditor editor)
 {
     if (_modelessList == null)
     {
         _modelessList = new List<CIXMessageEditor>();
     }
     _modelessList.Add(editor);
 }