     [Inspectable(category="General")]
     
     /**
-     *  When scrolling is enabled, clip the target's contents by 
-     *  setting its scrollRect.  If this property is set to false,
-     *  then the target's scrollRect will be null, even if its
-     *  scrollPosition is non-zero or its content size is larger
-     *  than its actual size.
-     * 
-     *  @default true
-     *  @see target
-     *  @see updateScrollRect
-     *  @see verticalScrollPosition
-     *  @see horizontalScrollPosition
+     *  @copy flex.intf.IViewport#clipContent
      */
     public function get clipContent():Boolean 
     {

                return 0;
        }    	
    } 
    
    /**
     *  Returns the amount one would have to add to the viewport's current 
     *  verticalScrollPosition to scroll by the requested "scrolling" unit.
     * 
     *  The value of unit must be one of the following flash.ui.Keyboard
     *  constants: UP, DOWN, PAGE_UP, PAGE_DOWN, HOME, END.
     * 
     *  To scroll by a single row use UP or DOWN and to scroll to the
     *  first or last row, use HOME or END.
     */
    public function horizontalScrollPositionDelta(unit:uint):Number
    {
        var g:GroupBase = target;
        if (!g)
            return 0;     

        var maxIndex:int = g.numLayoutItems -1;
        if (maxIndex < 0)
            return 0;

        var scrollR:Rectangle = g.scrollRect;
        if (!scrollR)
            return 0;
            
        var maxDelta:Number = g.contentWidth - scrollR.width - scrollR.x;
        var minDelta:Number = -scrollR.x; 
            
        switch (unit)
        {
            case Keyboard.UP:
                return (scrollR.x <= 0) ? 0 : -1;
                
            case Keyboard.DOWN:
                return (scrollR.x >= maxDelta) ? 0 : 1;
                
            case Keyboard.PAGE_UP:
                return Math.max(minDelta, -scrollR.width);
                
            case Keyboard.PAGE_DOWN:
                return Math.min(maxDelta, scrollR.width);
                
            case Keyboard.HOME: 
                return minDelta;
                
            case Keyboard.END: 
                return maxDelta;
                
            default:
                return 0;
        }       
    }
     
    /**
     *  Called when the verticalScrollPosition or horizontalScrollPosition 

    [Inspectable(category="General")]    
    
    /**
     *  @copy flex.intf.IViewport#verticalScrollPosition
     */
    public function get verticalScrollPosition():Number 
    {
