title: Flex percent-width not working
body: <p>I have a TitleWindow of dimensions 600 X 400. There are a bunch of VBoxes thrown in here that I want to occupy around 80% of the width of the title window in which they are contained.
  But they don't seem to register the percent-width property. This is what one of the VBoxes looks like </p>
  
  <pre><code>    &lt;mx:VBox  styleName="vboxes"&gt;
  .vboxes
          {
              cornerRadius:4;
              border-style:solid;
              percent-width:80;
              padding-left:5px;
              padding-right:5px;
              padding-bottom:5px;
              padding-top:5px;
          }
  </code></pre>
  
  <p>The other CSS properties such as border-style and corner-radius seem to register just fine but the percent-width property fails. As a side not, even the width style property fails in this case.</p>
  
  <p>Does anybody know what's wrong here? </p>