code: public void setWeekDay(String dayString) {
  
          final WeekDay day = WeekDay.valueOf(dayString);
          if (m_model.getWeekDay() != day) {
              removeExceptionsOnChange(new Command() {
  
                  public void execute() {
  
                      m_model.setWeekDay(day);
                      onValueChange();
                  }
              });
          }
  
      }
docs: Set the week day the event should take place.
  @param dayString the day as string.