     function set horizontalScrollPosition(value:Number):void;
      
      /**
-     *  The Y coordinate of the origin of the region this Group is
-     *  scrolled to.  
-     * 
-     *  If clipAndEnableScrolling is true, setting this property typically causes 
-     *  the <code>scrollRect</code> to be set to:
+     *  The y coordinate of the origin of the viewport in the component's coordinate system, 
+     *  where the default value is (0,0) corresponding to the upper-left corner of the component.
+     * 
+     *  If <code>clipAndEnableScrolling</code> is <code>true</code>, setting this property 
+     *  typically causes the viewport to be set to:
      *  <pre>
      *  new Rectangle(horizontalScrollPosition, verticalScrollPosition, width, height)
-     *  </pre>                 
+     *  </pre>
      * 
      *  Implementations of this property must be Bindable and
-     *  they must generate events of type "propertyChange".
+     *  must generate events of type <code>propertyChange</code>.
      *   
      *  @default 0
+     * 
      *  @see horizontalScrollPosition
      *  
      *  @langversion 3.0

    function set verticalScrollPosition(value:Number):void;
    
    /**
     *  Returns the amount one would have to add to the viewport's current 
     *  horizontalScrollPosition to scroll by the requested "scrolling" unit.
     * 
     *  The value of unit must be one of the following spark.core.ScrollUnit
     *  constants: LEFT, RIGHT, PAGE_LEFT, PAGE_RIGHT, HOME, END.
     * 
     *  To scroll by a single column use LEFT or RIGHT and to scroll to the
     *  first or last column, use HOME or END.
     * 
     *  @see ScrollUnit
     *  

    function getVerticalScrollPositionDelta(scrollUnit:uint):Number;
     
    /**
     *  If <code>true</code>, specifies to clip the children to the boundaries of the viewport. 
     *  If <code>false</code>, the container children extend past the container boundaries, 
     *  regardless of the size specification of the component. 
     *  
     *  @default false
     *
     *  @see LayoutBase#updateScrollRect
     *  @see verticalScrollPosition
     *  @see horizontalScrollPosition
