title: Highchart: Only show one series at a time
body: <p>I want to only show one series at a time.
  Also I want to disable the option to show no series at all.</p>
  
  <p>I found this: <a href="http://forum.highcharts.com/viewtopic.php?f=9&amp;t=6399" rel="nofollow">http://forum.highcharts.com/viewtopic.php?f=9&amp;t=6399</a>
  But the answer does not work.</p>