title: Highcharts - Reset zoom in synchronised charts
body: <p>I'm using the <em>syncExtremes</em> function to synchronise multiple charts (and their zooms) as implemented in the example below:</p>
  
  <p><a href="https://jsfiddle.net/pz2bak0u" rel="nofollow noreferrer">https://jsfiddle.net/pz2bak0u</a></p>
  
  <p>However I've come across two issues I can't seem to find my way around. The first one is that if you zoom multiple times in different charts without reseting and then click on one of the <em>Reset zoom</em> buttons, the other Reset zoom buttons hang around (and I would like them to disappear as they don't have any functionality when clicked).</p>
  
  <p>I then modified the fiddle to allow <em>xy</em> zooming:</p>
  
  <p><a href="https://jsfiddle.net/47dz68Lt" rel="nofollow noreferrer">https://jsfiddle.net/47dz68Lt</a></p>
  
  <p>If you zoom in on the first chart, then the second, and then the third, and try unzooming the first chart, the other two stay halfway zoomed. </p>
  
  <p>I've tried
  <code>chart.xAxis[0].setExtremes(null, null);</code> 
  but haven't had any luck. </p>
  
  <p>Is it even posible to reset all xy zooming in all charts at the same time as in the x zooming example?</p>