title: Round corners in textfield extjs
body: <p>I need to change style of a textfield in ExtJs</p>
  
  <p>The API docs shown that this is done by:</p>
  
  <pre><code>{
      xtype: 'textfield',
      fieldStyle: {
          'border-radius':'7px'
      }
  }
  </code></pre>
  
  <p>OR </p>
  
  <pre><code>xtype: 'textfield',
  style: {
      'border-radius':'7px'
  }
  </code></pre>
  
  <p>None of these seem to be having any effect, could anyone offer any advice?</p>