title: Events for HighCharts - MouseOver/MouseOut
body: <p>I'm using the HighCharts-Stock, and need to detect when mouse hovers over one of the points in the chart.
  Here's my code:</p>
  
  <pre><code> window.chart = new Highcharts.StockChart({
   plotOptions: {
              area: {
                  point: {
                      events: {
                          mouseOver: function () {
                              alert('over');
                          },
                          mouseOut: function () {
                              alert('out');
                          },
                          select: function () {
                              alert('select');
                          },
                          unselect: function () {
                              alert('unselect');
                          }
                      }
                  }
              }
          }, .....}
  </code></pre>
  
  <p>but non of these events fires!
  How can I enable them?</p>