code: public void addGroupFieldSet(String group, CmsFieldSet fieldSet) {
  
          // can't add a group field set twice
          if (!m_groupFieldSets.containsKey(group)) {
              m_groupFieldSets.put(group, fieldSet);
              m_panel.add(fieldSet);
          }
      }
docs: Adds a group specific field set.<p>
  
  @param group the group id
  @param fieldSet the field set