      *  @playerversion AIR 1.5
      *  @productversion Flex 4
      */
-    protected function getTargetScrollRect():Rectangle
+    protected function getScrollRect():Rectangle
     {
         var g:GroupBase = target;
         if (!g || !g.clipAndEnableScrolling)

 *  <p>Subclasses that support virtualization must respect the 
 *  <code>useVirtualLayout</code> property and should only retrieve
 *  layout elements within the scrollRect (the value of
 *  <code>getTargetScrollRect()</code>) using <code>getVirtualElementAt()</code>
 *  from within <code>updateDisplayList()</code>.</p>
 */
public class LayoutBase extends OnDemandEventDispatcher

        if (!g)
            return 0;     

        var scrollRect:Rectangle = getScrollRect();
        if (!scrollRect)
            return 0;
            
