code: private void fillWeekPanel() {
  
          addCheckBox(WeekOfMonth.FIRST.toString(), Messages.GUI_SERIALDATE_WEEKDAYNUMBER_1_0);
          addCheckBox(WeekOfMonth.SECOND.toString(), Messages.GUI_SERIALDATE_WEEKDAYNUMBER_2_0);
          addCheckBox(WeekOfMonth.THIRD.toString(), Messages.GUI_SERIALDATE_WEEKDAYNUMBER_3_0);
          addCheckBox(WeekOfMonth.FOURTH.toString(), Messages.GUI_SERIALDATE_WEEKDAYNUMBER_4_0);
          addCheckBox(WeekOfMonth.LAST.toString(), Messages.GUI_SERIALDATE_WEEKDAYNUMBER_5_0);
      }
docs: Fills the week panel with checkboxes.