public void onSort(SortEvent sortEvent) {
        String[] inputTextIds = { "pname", "comnr", "daynr", "daystr" };
        for (int i = 0; i < inputTextIds.length; i++) {
            changeAttributeValue(inputTextIds[i]);
        }
        //CATEGORY CUSTOM SORT BEGIN
        List sortList = sortEvent.getSortCriteria();
        SortCriterion sc = (SortCriterion)sortList.get(0);

        if (((String)sc.getProperty()).equalsIgnoreCase("CategoryName")) {

            sortList = new ArrayList();
            SortCriterion sc2 = new SortCriterion("CompanyNr", true);
            SortCriterion sc3 = new SortCriterion("DateDay", true);
            SortCriterion sc4 = new SortCriterion("StartTime", true);
            SortCriterion sc5 = new SortCriterion("RowNum", true);
            sortList.add(sc);
            sortList.add(sc2);
            sortList.add(sc3);
            sortList.add(sc4);
            sortList.add(sc5);


            RichTable ct = (RichTable)sortEvent.getComponent();
            ct.setSortCriteria(sortList);
        }
        //CATEGORY CUSTOM SORT END
    }