code: public int fieldChanged(boolean bDisplayOption, int iMoveMode)
      {
          boolean bFlag = this.compareFieldToString();
          if (m_bDisableIfMatch)
              bFlag = !bFlag;
          m_fldToDisable.setEnabled(bFlag);
          return DBConstants.NORMAL_RETURN;
      }
docs: The Field has Changed.
  If the target string matches this field, disable the target field.
  @param bDisplayOption If true, display the change.
  @param iMoveMode The type of move being done (init/read/screen).
  @return The error code (or NORMAL_RETURN if okay).
  Disable field if criteria met.