private void fill(int daysOfMonth) {
        removeRows();
        for (Employee employee : RoosterProgramma.getInstance().getEmployees()) {
            if ((chkClerk.isSelected() && employee.isClerk())
                    || (chkMuseumEducator.isSelected() && employee.isMuseumEducator())
                    || (chkCallWorker.isSelected() && employee.isCallWorker())) {
                insertEmployeeIntoTable(employee, daysOfMonth);
            }
        }
        for (int i = 1; i <= daysOfMonth; i++) {
            tblSchedule.getColumnModel().getColumn(i + 2).setPreferredWidth(50);
        }
    }