docs: public int fieldChanged(boolean bDisplayOption, int iMoveMode)
      {
          int iErrorCode = super.fieldChanged(bDisplayOption, iMoveMode);
          if (iErrorCode != DBConstants.NORMAL_RETURN)
              return iErrorCode;
          if (iMoveMode == DBConstants.INIT_MOVE)
              this.retrieveValue();
          if (iMoveMode == DBConstants.SCREEN_MOVE)
              this.saveValue();
          return iErrorCode;
      }