title: Legend is disappearing on HighCharts pie refreshing
body: <p>Here is my code:</p>
  
  <pre><code>                plotOptions: {
                      pie: {
                          allowPointSelect: true,
                          cursor: 'pointer',
                          borderWidth: 3,
                          size: '90%',
                          dataLabels: {
                              enabled: false
                          },
                          showInLegend: true
                      }
                  },
                  series: [{
                      type: 'pie',
                      name: 'Browser share',
                      data: [
                          ['item1',   35],
                          ['item2',       35],
                          ['item3',    30]
                      ]
                  }]
              });
  
              $('.poll1 a').click(function() {
                  $('.poll1 a').removeClass('active');
                  $(this).addClass('active');
                  chart.series[0].setData( [
                          ['item1',   75],
                          ['item2',       15],
                          ['item3',    10]
                      ]);
              });
          });
  </code></pre>
  
  <p>On click data in pie should be refreshed. It happens but the legend is disapearing. What I'm doing wrong? How can I leave legend in the same place?</p>
  
  <p>Thanx in advance.</p>