r1.setSeriesNegativeItemLabelPosition(0, new ItemLabelPosition(
                ItemLabelAnchor.CENTER, TextAnchor.CENTER));
        assertTrue(detector.getNotified());

        detector.setNotified(false);
        r1.setBaseNegativeItemLabelPosition(new ItemLabelPosition(
                ItemLabelAnchor.CENTER, TextAnchor.CENTER));
        assertTrue(detector.getNotified());