title: Highcharts custom events plugin right click event not firing
body: <p><a href="http://jsfiddle.net/ovbpacrt/1/" rel="nofollow noreferrer">http://jsfiddle.net/ovbpacrt/1/</a></p>
  
  <p>I can't get the <code>contextmenu</code> event to fire on a right click in the above.</p>
  
  <pre><code>chart = new Highcharts.Chart(
  {
     series:[
        {
           "data": data,
            type: 'pie',
            animation: false,
            point:{
                events:{
                    contextmenu: function (event) {
                        alert(this.id);
                    }
                }
            }          
        }
     ],
     "chart":{
        "renderTo":"container"
     },
  });
  </code></pre>
  
  <p>If I change the <code>contextmenu</code> to <code>click</code> (and instead left click), then the event works correctly.</p>
  
  <p>What maybe the cause of the issue?</p>