      */
     public function set clipAndEnableScrolling(value:Boolean):void 
     {
+        clipAndEnableScrollingExplicitlySet = true;
         if (_layout)
         {
             _layout.clipAndEnableScrolling = value;

    //----------------------------------
    //  clipAndEnableScrolling
    //----------------------------------
    
    /**
     *  @copy spark.core.IViewport#clipAndEnableScrolling

    {
        if (_layout == value)
            return;
        
        if (_layout)
        {
            _layout.target = null;
            _layout.removeEventListener(PropertyChangeEvent.PROPERTY_CHANGE, redispatchLayoutEvent);

            if (clipAndEnableScrollingExplicitlySet)
            {
                // when the layout changes, we don't want to transfer over 
                // horizontalScrollPosition and verticalScrollPosition
                _layoutProperties = {clipAndEnableScrolling: _layout.clipAndEnableScrolling};
            }
        }

        _layout = value; 

        if (_layout)
        {
            _layout.target = this;
            _layout.addEventListener(PropertyChangeEvent.PROPERTY_CHANGE, redispatchLayoutEvent);

            if (_layoutProperties)
            {
                if (_layoutProperties.clipAndEnableScrolling !== undefined)
