title: Highcharts dynamicly update legend with grouped values
body: <p>I'm trying to get the legend to show the grouped value for the series, and to dynamically update it when the range is changed.</p>
  
  <p>By changing the range, I mean clicking on range selector, moving the navigator or zooming in/out.</p>
  
  <p>I've managed to show the total when the chart is loaded. But I want to show only the total for the current range selected, not of the whole data.</p>
  
  <p>I tried with a function on <code>labelFormatter</code>. I can access <code>this.yData</code>, which is all the data. But I can't access <code>this.groupedData</code> or <code>this.processedYData</code>, to get only the current data grouped. It gives me <code>undefined</code>.</p>
  
  <p>But I suppose the best way is to use <code>redraw</code> on <code>events</code> to update the legend. But even with this I can't access the grouped values, only the total of all data.</p>
  
  <p>Here is the fiddle with what I got so far: <a href="http://jsfiddle.net/3H3ac/" rel="nofollow">http://jsfiddle.net/3H3ac/</a></p>
  
  <p>Any idea how I can do this?</p>