title: Highchart - show / hide an y-Axis without hiding the series
body: <p>I'm working with Highchart.
  I've got a multiple series graph in which each series have their own y-axis.</p>
  
  <p><a href="http://jsfiddle.net/39xBU/1/" rel="noreferrer">pretty much like this one (jsfiddle)</a>  </p>
  
  <p>when we click on the legend item for a series, it hides it and the associated y-axis
  (using <code>showEmpty:false</code> helped hiding also the name of the axes)</p>
  
  <p>What I'm trying to achieve is hiding the y-Axis of a given series without hiding the series itself.</p>
  
  <p>I tried to hide it by modifying the showAxis property like this : </p>
  
  <pre><code>serie.yAxis.showAxis = false;
  </code></pre>
  
  <p>but it doesn't work.
  Anyone  knows how I should do ?</p>
  
  <p>EDIT : I managed to edit the text so I can remove the axis title by setting the text to null but its not enough to hide the whole axis and its values.</p>
  
  <p>here's what i did to edit the text: </p>
  
  <pre><code>serie.yAxis.axisTitle.attr({
              text: null
          });
  </code></pre>