title: ExtJS 4 : How To Destroy All States When User Logout
body: <p>I've set my app to use state with this code:</p>
  
  <pre><code>Ext.state.Manager.setProvider(new Ext.state.CookieProvider());
  </code></pre>
  
  <p>But now I'm having a problem. How to destroy all states cookies??</p>
  
  <p>My app needs to destroy the states when user clicks logout button.</p>
  
  <p>I've tried this, but it doesn't work:</p>
  
  <pre><code>Ext.state.Manager.clear();
  </code></pre>
  
  <p>How to solve this?? Thank you very much.</p>