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

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