title: Manually Triggering drillup event, highcharts
body: <p>I am working on drilldown/up chart of highchart.. i was able to trigger drill down event on a point click from outside highchart through:</p>
  
  <pre><code>chart.series[0].data[0].firePointEvent('click', event);
  </code></pre>
  
  <p>but i can't find any event which would trigger on the back button of the chart. See this <a href="http://jsfiddle.net/yw4Vh/109/" rel="nofollow">fiddle</a>
  I want to programatically trigger click event on "Back to Overview" event. Thank You in advance.</p>