title: ExtJS 4.2 dataview - how to know if item is selected
body: <p>HI I have a DataView with XTemplate.</p>
  
  <p>In my controller, I listen to the <code>itemclick</code> event.</p>
  
  <pre><code>onItemClick: function(view, record, item) {
          var me = this,
              panel = me.getRightPanel();
  
          // here I need to know if the item clicked is already selected
  
  }
  </code></pre>
  
  <blockquote>
    <p>Is there a way to know if the item clicked is already selected?</p>
  </blockquote>