title: Scrollbars are not showing up in Spark DataGrid with Flex 4.5.1 but do show up with 4.6
body: <p>I have a Spark DataGrid that does not show Scrollbars when the SDK is 4.5 or earlier. If I set the SDK to 4.6 they show up correctly. </p>
  
  <p>Has anyone seen this or knows how to get the scrollbars to show up correctly?</p>
  
  <p>This is the CSS I used:</p>
  
  <pre><code>s|Scroll {
      skinClass: ClassReference("view.skins.CustomScrollerSkin");
  }
  </code></pre>
  
  <p>This is the skin basically:</p>
  
  <p>
      
      
          
      </p>
  
  <pre><code>&lt;!---  A horizontal scrollbar that lets you control the portion of data that is displayed 
  when there is too much data to fit horizontally in a display area.
  The Scroller determines whether the horizontal ScrollBar is visible. --&gt;
  &lt;fx:Component  id="horizontalScrollBarFactory"&gt;
      &lt;s:HScrollBar visible="false" /&gt;
  &lt;/fx:Component&gt; 
  </code></pre>
  
  <p></p>