title: Highcharts' getExtremes function can't return correct dataMax
body: <p>I am using one highchart to control another one. After setting the chart.evetns.selection, chart.yAxis.getExtremes can't return correct dataMax if I zoom a tiny region. However, if I click once again, then it return the correct one. Any suggestion to avoid this? here is my code: <a href="http://jsfiddle.net/tianhuidong/Jhupu/" rel="nofollow">http://jsfiddle.net/tianhuidong/Jhupu/</a></p>
  
  <pre><code>$(function () {
      $('#container1').highcharts({
          chart: {
              events: {
                  selection: function (event) {
                      m1 = event.xAxis[0].min
                      m2 = event.xAxis[0].max
                      var chart1 = $('#container1').highcharts()
                      var chart2 = $('#container2').highcharts()
                      chart1.xAxis[0].setExtremes(m1, m2);
                      chart2.xAxis[0].setExtremes(m1, m2);
                  },
                  click: function (event) {
                      var chart1 = $('#container1').highcharts()
                      var chart2 = $('#container2').highcharts()
                      xx = chart1.xAxis[0].getExtremes()
                      yy = chart1.yAxis[0].getExtremes()
                      alert(yy.min)
                      alert(yy.dataMax)
                      alert(yy.userMax)
                      alert(Object.keys(yy))
                      chart1.xAxis[0].setExtremes(xx.dataMin, xx.dataMax);
                      chart1.yAxis[0].setExtremes(yy.dataMin, yy.dataMax);
                      chart2.xAxis[0].setExtremes(xx.dataMin, xx.dataMax);
                  }
              },
              zoomType: 'xy'
          },
  
  
          tooltip: {
              crosshairs: true
          },
          plotOptions: {
              series: {
                  events: {
                      legendItemClick: function (event) {
                          var chart1 = $('#container1').highcharts()
                          var chart2 = $('#container2').highcharts()
                          //alert(Object.keys(chart1.series[0]))
                          chart2.series[0].hide()
                          //chart2.showResetZoom()
                          //alert(Object.keys(chart.resetZoomButton))
  
  
  
                      }
                  }
              }
          },
  
          xAxis: {
              categories: ['Jan', 'Feb', 'Mar', 'Apr', 'May', 'Jun', 'Jul', 'Aug', 'Sep', 'Oct', 'Nov', 'Dec', 'Jan', 'Feb', 'Mar', 'Apr', 'May', 'Jun', 'Jul', 'Aug', 'Sep', 'Oct', 'Nov', 'Dec']
          },
  
          series: [{
              data: [29.9, 71.5, 186.4, 129.2, 144.0, 176.0, 135.6, 148.5, 216.4, 194.1, 95.6, 54.4, 29.9, 71.5, 186.4, 129.2, 144.0, 176.0, 135.6, 148.5, 216.4, 194.1, 95.6, 54.4]
          }]
  
      });
  });
  
  $(function () {
      $('#container2').highcharts({
          xAxis: {
              categories: ['Jan', 'Feb', 'Mar', 'Apr', 'May', 'Jun', 'Jul', 'Aug', 'Sep', 'Oct', 'Nov', 'Dec', 'Jan', 'Feb', 'Mar', 'Apr', 'May', 'Jun', 'Jul', 'Aug', 'Sep', 'Oct', 'Nov', 'Dec']
          },
  
          series: [{
              data: [29.9, 71.5, 106.4, 129.2, 144.0, 176.0, 135.6, 148.5, 116.4, 194.1, 95.6, 54.4, 29.9, 71.5, 186.4, 129.2, 144.0, 176.0, 135.6, 148.5, 216.4, 194.1, 95.6, 54.4]
          }]
  
      });
  });
  </code></pre>