title: highcharts pass multiple values to tooltip
body: <p>I need to display 3 values on the tooltip:
  the time, the value and another value(change).</p>
  
  <p>I saw <a href="http://www.highcharts.com/stock/demo/candlestick" rel="noreferrer">this example</a> (but the jsdfiddle is not working). </p>
  
  <p>I tried this</p>
  
  <pre><code>//each loop..
  indice.push(["time", "value1", "value2"]);
  </code></pre>
  
  <p>, the tooltip settings</p>
  
  <pre><code>tooltip:
      {
      useHTML: true,
      formatter: function()
      {
        return '' + Highcharts.dateFormat('%H:%M:%S', this.x) +'; '+ this.y + this.z(&lt;-is this right?);
      }
  },
  </code></pre>
  
  <p>and the series</p>
  
  <pre><code>series:
  [{
      type: 'area',
      data: indice
  }]
  </code></pre>
  
  <p>can somone help pls?
  thsnks.</p>