      *  The Y coordinate of the origin of the region this Group is
      *  scrolled to.  
      * 
-     *  If clipContent is true, stting this property typically causes 
+     *  If clipAndEnableScrolling is true, setting this property typically causes 
      *  the <code>scrollRect</code> to be set to:
      *  <pre>
      *  new Rectangle(horizontalScrollPosition, verticalScrollPosition, width, height)

     *  The X coordinate of the origin of the region the target is
     *  scrolled to.  
     * 
     *  If clipContent is true, setting this property typically causes 
     *  <code>scrollRect</code> to be set to:
     *  <pre>
     *  new Rectangle(horizontalScrollPosition, verticalScrollPosition, width, height)

     * 
     *  @see ScrollUnit
     */
    function getVerticalScrollPositionDelta(scrollUnit:uint):Number;
     
    /**
     *  This flag must set to true to enable scrolling via the
     *  vertical and horizontalScrollPosition properties. 
     *  
     *  If true then viewport's contents are clipped by setting its scrollRect
     *  to a rectangle with origin at horizontalScrollPosition,
     *  verticalScrollPosition and width and height equal to the 
     *  viewport's width and height.
