title: Setting a four hour range in highcharts
body: <p>I'm showing some vital signs in a highstock graph, with the scrollbar enabled. I only want to show a 4 hour window along the xAxis no matter where the user scrolls, or how much data is loaded. When the graph is initially loaded, I set the min and max value, and I've set the minRange to four hours, but when the scrollbar is used some really weird behavior ensues: the xAxis scale changes, and the scrollbar seems to jump back and forth. Here are some of the config options:</p>
  
  <pre><code>defaultOptions = {
      title: {
          text: ""
      },
      navigator: {
          enabled: false
      },
      rangeSelector: {
          enabled: false
      },
      plotOptions: {
          series: {
              stickyTracking: false
          }
      },
      tooltip: {
          animation: false,
          crosshairs: false,
          shared: false,
          formatter: tooltipFormatter
      },
      credits: {
          enabled: false
      },
      xAxis: {
          minRange: chartRangeInMillis,
          maxZoom: chartRangeInMillis,
          min: 1364229900000,
          max: 1364244300000,
          tickInterval: 15 * 60 * 1000,
          minTickInterval: 15 * 60 * 1000,
          startOnTick: true,
          gridLineWidth: 1,
          ordinal: false,
          endOnTick: false,
          labels: {
              formatter: function () {
                  var d = new Date(this.value);
                  return (d.getMinutes() === 0) ? '&lt;b&gt;' + Highcharts.dateFormat('%H:%M', this.value) + '&lt;/b&gt;' : d.getMinutes();
              }
          }
      },
      yAxis: {
          lineWidth: 2,
          min: 0,
          max: 250,
          offset: 0,
          tickInterval: 50,
          showLastLabel: true,
          labels: {
              align: 'right',
              x: -5,
              y: 3
          }
      }
  };
  </code></pre>
  
  <p>You can see the behavior here: <a href="http://jsfiddle.net/6w3C3/" rel="nofollow">http://jsfiddle.net/6w3C3/</a></p>
  
  <p>I've tried setting the extremes on redraw and via other event callbacks, but to no avail. What am I missing?</p>