title: Using icons in ExtJS
body: <p>I am trying to add icons to my toolbar buttons in extJS. In my case, i want a refresh icon in my button.</p>
  
  <p>Is there an <em>easy</em> and <em>standard</em> way of doing this? I can't seem to be able to find any decent documentation on the web.</p>
  
  <p>My toolbar button :</p>
  
  <pre><code>{
              text: 'Reset',
              icon: 'refresh',
              tooltip: 'Reset Grid Layout'
  }
  </code></pre>
  
  <p>putting refresh here doesn't do anything. There is an empty space in my button where something should be. Ie. it understands 'icon', it doesn't understand 'refresh'.</p>
  
  <ul>
  <li>Do you have to put in the full path to some ExtJS subdirectory? </li>
  <li>Is there some set list of icons you can use?</li>
  </ul>