title: getSelection array values for MULTI Select list in Sencha
body: <p>I don't know how to get the values of the MULTI select list.</p>
  
  <p>I have tried to use the method <code>getSelection</code>; however, I'm getting an error that it's undefined.  Here's my code:</p>
  
  <pre><code>refs : {
      optionlist : 'Overlayitemlist',
  },
  var reco= Ext.getCmp('optionlist').getSelection() ;
  </code></pre>
  
  <p>Here's the error:  </p>
  
  <blockquote>
    <p>Uncaught TypeError: Cannot call method 'getSelection' of undefined </p>
  </blockquote>
  
  <p>Where am I going wrong?</p>