code: private String joinElements(int length)
     {
        StringBuilder sb = new StringBuilder();
        for (int index = 0; index < length; index++)
        {
           sb.append(m_elements.get(index));
        }
        return sb.toString();
     }
docs: Joins the individual WBS elements to make the formated value.
  
  @param length number of elements to join
  @return formatted WBS value