title: Flex 3 scroll bars not added/enabled when they should be
body: <p>I'm currently learning Flex, and am having the hardest time getting scroll bars to work. In short, I'm making a giant form for users to fill out, contained within a viewstack component.  The user will type up information in one view, and it will be displayed in the other. But right now in the first canvas I have components that run off the screen and flex doesn't automatically add a scroll bar, so I added 'verticalScrollPolicy="on"' to my canvas.  Now, while it gives me a scroll bar, it gives me an empty scroll bar.  I still cannot move it up or down, meaning components are still trapped off the bottom of my screen. Am I missing something simple?</p>
  
  <p>Edit - I'm using Adobe Flex Builder 3, and the components it lets you drag in. <a href="http://img12.imageshack.us/img12/218/problem1f.jpg" rel="nofollow noreferrer">http://img12.imageshack.us/img12/218/problem1f.jpg</a> This is a picture of the problem, and i guess relavent code would be. </p>
  
  <pre><code> &lt;mx:Application xmlns:mx="adobe.com/2006/mxml" layout="absolute" width="830" height="835"&gt; 
  &lt;mx:ViewStack x="10" y="72" id="viewstack1" width="790" height="751" &gt;
  
  &lt;mx:Canvas label="Design Mode" width="100%" height="100%" verticalScrollPolicy="on" horizontalScrollPolicy="on" &gt; 
  (Components inside)
  &lt;/mx:Canvas&gt; 
  </code></pre>