title: Highcharts drilldown to pie chart - Clicking on axis label with multiple series causes pie charts to overlap
body: <p>I have a stacked column chart that drills down to a pie chart.  The drilldown works fine if the data point is clicked.  However, the xAxis labels are also clickable which displays the all pie charts for those points in the series.  Unfortunately they overlap.</p>
  
  <p>Is there some way to disable drilldown on the xAxis labels?</p>
  
  <p>Here is a JSFiddle:  <a href="http://jsfiddle.net/uEQL2/" rel="nofollow">http://jsfiddle.net/uEQL2/</a></p>
  
  <pre><code>$(function () {    
  
  // Create the chart
  $('#container').highcharts({
      chart: {
          type: 'column'
      },
      title: {
          text: 'Basic drilldown'
      },
      xAxis: {
          type: 'category'
      },
  
      plotOptions: {
          column : {
              stacking : 'normal'
          }
      },
  
      series: [{
          name: 'On Time',
          data: [{
              name: 'Location 1',
              y: 5,
              drilldown: 'l1-ot'
          }, {
              name: 'Location 2',
              y: 2,
              drilldown: 'l2-ot'
          }, {
              name: 'Location 3',
              y: 4,
              drilldown: 'l3-ot'
          }]
      },{
          name: 'Late',
          data: [{
              name: 'Location 1',
              y: 5,
              drilldown: 'l1-l'
          }, {
              name: 'Location 2',
              y: 8,
              drilldown: 'l2-l'
          }, {
              name: 'Location 3',
              y: 6,
              drilldown: 'l3-l'
          }]
      }],
      drilldown: {
          series: [{
              type: 'pie',
              id: 'l1-ot',
              data: [
                  {name: 'Widget A', y: 2},
                  {name: 'Widget B', y: 3},
              ]
          }, {
              type: 'pie',
              id: 'l1-l',
              data: [
                  {name: 'Widget A', y: 1},
                  {name: 'Widget B', y: 4},
              ]
          }, {
              type: 'pie',
              id: 'l2-ot',
              data: [
                  {name: 'Widget A', y: 1},
                  {name: 'Widget B', y: 1},
              ]
          },  {
              type: 'pie',
              id: 'l2-l',
              data: [
                  {name: 'Widget A', y: 2},
                  {name: 'Widget B', y: 6},
              ]
          },{
              type: 'pie',
              id: 'l3-ot',
              data: [
                  {name: 'Widget A', y: 1},
                  {name: 'Widget B', y: 3},
              ]
          },  {
              type: 'pie',
              id: 'l3-l',
              data: [
                  {name: 'Widget A', y: 3},
                  {name: 'Widget B', y: 3},
              ]
          }
  
                  ]
      }
  })
  </code></pre>
  
  <p>});</p>