code: protected List<CmsSelectWidgetOption> getComboCronExpressions() {
  
          List<CmsSelectWidgetOption> result = new ArrayList<CmsSelectWidgetOption>();
  
          // 0 0 3 * * ? (daily at 3 am)
          result.add(new CmsSelectWidgetOption("0 0 3 * * ?", false, null, key(Messages.GUI_EDITOR_CRONJOB_EXAMPLE1_0)));
          // 0 0/30 * * * ? (daily every thirty minutes)
          result.add(
              new CmsSelectWidgetOption("0 0/30 * * * ?", false, null, key(Messages.GUI_EDITOR_CRONJOB_EXAMPLE2_0)));
          // 0 30 8 ? * 4 (every Wednesday at 8:30 am)
          result.add(new CmsSelectWidgetOption("0 30 8 ? * 4", false, null, key(Messages.GUI_EDITOR_CRONJOB_EXAMPLE3_0)));
          // 0 15 18 15 * ? (on the 20th day of the month at 6:15 pm)
          result.add(
              new CmsSelectWidgetOption("0 15 18 20 * ?", false, null, key(Messages.GUI_EDITOR_CRONJOB_EXAMPLE4_0)));
          // 0 45 15 ? * 1 2007-2009 (every Sunday from the year 2007 to 2009 at 3:45 pm)
          result.add(
              new CmsSelectWidgetOption(
                  "0 45 15 ? * 1 2007-2009",
                  false,
                  null,
                  key(Messages.GUI_EDITOR_CRONJOB_EXAMPLE5_0)));
          return result;
      }
docs: Returns the example cron expressions to show in the combo box.<p>
  
  The result list elements are of type <code>{@link org.opencms.widgets.CmsSelectWidgetOption}</code>.<p>
  
  @return the example cron expressions to show in the combo box