if (_set instanceof LinkedHashSet) {
                //bug  1870996 Exception when use ListModelSet with SimpleListModelSharer
                //java.lang.IndexOutOfBoundsException: 1, interval added index should be _set.size() - 1
                final int i1 = _set.size() - 1;
                fireEvent(ListDataEvent.INTERVAL_ADDED, i1, i1);