docs: public void addListeners()
      {
          super.addListeners();
          this.getMainRecord().setKeyArea(CalendarEntry.START_DATE_TIME_KEY);
          BaseField fieldTrue = new BooleanField(null, "FalseField", DBConstants.DEFAULT_FIELD_LENGTH, "FalseField", null);
          fieldTrue.setState(true);
          this.getMainRecord().addListener(new FreeOnFreeHandler(fieldTrue));
          //+this.getMainRecord().addListener(new CompareFileFilter(CalendarEntry.HIDDEN, fieldTrue, "<>", null, true));
          this.setEditing(true);
      }