code: public FieldInfo getField(int iKeyFieldSeq)
      {
          if (iKeyFieldSeq >= m_vKeyFieldList.size())
              return null;
          return (FieldInfo)m_vKeyFieldList.elementAt(iKeyFieldSeq);
      }
docs: Get the Field in this KeyField.
  @param iKeyFieldSeq The position of this field in the key area.
  @return The field.