title: How to do Drilldown in Piechart of Highchart?
body: <p>I have Drilled the "Column chart". 
  &amp; Now I want to Drill down the "Pie chart"</p>
  
  <p>my code for showing Pie chart is as below,</p>
  
  <pre><code>$(function () {
      var chart;
      $(document).ready(function() {
          chart = new Highcharts.Chart({
              chart: {
                  renderTo: 'container',
  
              },
              title: {
                  text: ''
              },
              tooltip: {
                  pointFormat: '{series.name}: &lt;b&gt;{point.percentage}%&lt;/b&gt;',
                  percentageDecimals: 1
              },
              plotOptions: {
                  pie: {
                      allowPointSelect: true,
                      cursor: 'pointer',
                      dataLabels: {
                          enabled: true,
                          color: '#000000',
                          connectorColor: '#000000',
                          formatter: function() {
                              return '&lt;b&gt;'+ this.point.name +'&lt;/b&gt;: '+ Math.round(this.percentage) +' %';
                          }
                      }
                  }
              },
              series: 
                  [{
                     type:'pie',
                      data: model.mixchart
  
                  }]
  });
  });
  
  });
  </code></pre>
  
  <p>How can I do drilldown in this ?</p>
  
  <p>After Drilldown It should show the Pie chart only. So what should I do for that in the code abve?</p>
  
  <p>At least just Give me some reference links for drilldown in Pie chart so that I can Prefer that one.</p>