public String generateToolTip(XYDataset dataset, int series, int item) {
String result = null;
if (dataset instanceof OHLCDataset) {
OHLCDataset d = (OHLCDataset) dataset;
Number high = d.getHigh(series, item);
Number low = d.getLow(series, item);
Number open = d.getOpen(series, item);
Number close = d.getClose(series, item);
Number x = d.getX(series, item);
result = d.getSeriesKey(series).toString();
if (x != null) {
Date date = new Date(x.longValue());
result = result + "--> Date=" + this.dateFormatter.format(date);
if (high != null) {