title: event.ctrlKey works in IE and Chrome but not Firefox on legendItemClick
body: <p>Built a feature that deselects all but the ctrl-clicked item.  It works fine in IE and Chrome, but not in Firefox.<br>
  Try the jsfiddle at <a href="http://jsfiddle.net/PJVK3/" rel="nofollow">http://jsfiddle.net/PJVK3/</a></p>
  
  <p>Tried to capture the same event with simple javascript code and the same problem occurs.
  This works in Chrome(24.0.1312.57) and IE(9), but not Firefox(18.0.2):</p>
  
  <pre><code>&lt;!DOCTYPE html&gt;
  &lt;html&gt;
  &lt;head&gt;
  &lt;script&gt;
  function myFunction()
  {
  if (event.ctrlKey){document.getElementById("demo").innerHTML="ctl key pressed";}
  if (!event.ctrlKey){document.getElementById("demo").innerHTML="ctl key NOT pressed";}
  }
  &lt;/script&gt;
  &lt;/head&gt;
  &lt;body&gt;
  &lt;p&gt;Click the button to trigger a function.&lt;/p&gt;
  &lt;button onclick="myFunction()"&gt;Click me&lt;/button&gt;
  &lt;p id="demo"&gt;&lt;/p&gt;
  &lt;/body&gt;
  &lt;/html&gt;
  </code></pre>
  
  <p>Whatup?  anyone?</p>