private class MyNatTableComparatorChooser<T> extends NatTableComparatorChooser<T> {

        private final Comparator<? super T> defaultComparator;

        public AlarmNatTableComparatorChooser(final SortedList<T> sortedList,
                final TableFormat<T> tableFormat) {
            super( sortedList, tableFormat );
            defaultComparator = sortedList.getComparator();
        }

        @Override
        protected void rebuildComparator() {
            super.rebuildComparator();

            // select the new default comparator
            sortedList.getReadWriteLock().writeLock().lock();
            try {
                if( sortedListComparator == null ) {
                    sortedListComparator = defaultComparator;
                    sortedList.setComparator( defaultComparator );
                }
            } finally {
                sortedList.getReadWriteLock().writeLock().unlock();
            }

        }
    }