code: function(properties, data) {
              var xAxisKey = this.xAxis.getKey(),
                  useTimeNames = (data.xAxisType === 'time'),
                  xFieldName = Splunk.JSCharting.ParsingUtils.escapeHtml(data.fieldNames[0]),
                  yFieldName = Splunk.JSCharting.ParsingUtils.escapeHtml(data.fieldNames[1]),
                  resolveX = this.xAxis.formatTooltipValue.bind(this.xAxis),
                  resolveY = this.yAxis.formatTooltipValue.bind(this.yAxis),
                  resolveName = this.getTooltipName.bind(this);
  
              if(this.mode === 'multiSeries') {
                  $.extend(true, this.hcConfig, {
                      tooltip: {
                          formatter: function() {
                              var seriesColorRgb = Splunk.JSCharting.ColorUtils.removeAlphaFromColor(this.series.color);
                              return [
                                 '<span style="color:#cccccc">', (useTimeNames ? 'time: ' : xAxisKey + ': '), '</span>',
                                 '<span style="color:', seriesColorRgb, '">', resolveName(this, useTimeNames), '</span> <br/>',
                                 '<span style="color:#cccccc">', xFieldName, ': </span>',
                                 '<span style="color:#ffffff">', resolveX(this, "x"), '</span> <br/>',
                                 '<span style="color:#cccccc">', yFieldName, ': </span>',
                                 '<span style="color:#ffffff">', resolveY(this, "y"), '</span>'
                              ].join('');
                          }
                      }
                  });
              }
              else {
                  $.extend(true, this.hcConfig, {
                      tooltip: {
                          formatter: function() {
                              return [
                                 '<span style="color:#cccccc">', xAxisKey, ': </span>',
                                 '<span style="color:#ffffff">', resolveX(this, "x"), '</span> <br/>',
                                 '<span style="color:#cccccc">', xFieldName, ': </span>',
                                 '<span style="color:#ffffff">', resolveY(this, "y"), '</span>'
                              ].join('');
                          }
                      }
                  });
              }
          }
docs: override