Returns a comma-separated list of all the underlying numeric values (as a string) of an
      enumeration type. The method returns an error if invoked on a type that is not an enumeration.
        Return type: CHARACTER
        Access: PUBLIC
        Applies to:Progress.Lang.Class class
 
    
    Notes
- The list of values is returned in ascending order. For flag enum types, the  positive numeric
          values are listed in ascending order first, and then the negative numeric values are
          listed next, also in ascending order.