code: public Object getFieldState()
      {
          if (this.getScreenField().getConverter() == null)
              return null;
          String string = this.getScreenField().getConverter().getString();
          if (string == null)
              string = Constants.BLANK;
          return string;
      }
docs: Get this field's current state in an object that can be used to set this
  component's converter value using setConverterState(obj).
  @return The field's value (class defined by the field type).