title: Flex 4 error labelWidth
body: <p>Im getting a error in my application with the labelWidth the question is simple i think, but i cant find the right answer.
  code:</p>
  
  <pre><code>&lt;s:FormItem labelWidth="0"&gt;
  </code></pre>
  
  <p>Error:
  <strong>Cannot resolve attribute 'labelWidth' for component type spark.components.FormItem.</strong></p>
  
  <p>I´m migrating from flex 3 to 4 and a lot of things changed in application design
  How can i use the labelWidth in spark?</p>