code: public FieldList getFieldList(int iIndex)
      {
          if (m_vFieldListList == null)
              return null;
          if (iIndex >= m_vFieldListList.size())
              return null;
          return (FieldList)m_vFieldListList.get(iIndex);
      }
docs: Return the FieldList describing the screen's fields.
  Note: This is used so you can override this method to use more that one field list.
  @return The fieldlist for this screen (null if you are past the end of the list).