     [Inspectable(category="General")]
     
     /**
-     *  @copy flex.intf.IViewport#clipAndEnableScrolling
+     *  @copy spark.core.IViewport#clipAndEnableScrolling
+     *
+     *  @default false
      *  
      *  @langversion 3.0
      *  @playerversion Flash 10

     *  the elements.  Layout classes usually override those methods instead of
     *  getVerticalScrollPositionDelta(). 
     * 
     *  @see #getElementBoundsAboveScrollRect
     *  @see #getElementBoundsBelowScrollRect
     *  @see #getVerticalScrollPositionDelta

    
   /**
     *  Returns the specified element's layout bounds as a Rectangle or null
     *  if the index is invalid, the corresponding element is null,
     *  <code>includeInLayout=false</code>, 
     *  or if this layout's <code>target</code> property is null.
     *   
     *  <p>Layout subclasses that support <code>useVirtualLayout=true</code> must
     *  override this method to compute a potentially approximate value for
     *  elements that are not in view.</p>
     * 
     *  @param index Index of the layout element.
     * 
     *  @return The specified element's layout bounds.
     *
     *  @see mx.core.ILayoutElement#getLayoutBoundsX()
     *  @see mx.core.ILayoutElement#getLayoutBoundsY()
     *  @see mx.core.ILayoutElement#getLayoutBoundsWidth()
     *  @see mx.core.ILayoutElement#getLayoutBoundsHeight()
     *   
     *  @langversion 3.0
     *  @playerversion Flash 10
