         if (instance == verticalScrollBar)
         {
         	verticalScrollBar.addEventListener("valueCommit", vsb_valueCommitHandler);
+        	//verticalScrollBar.minHeight = 0;
         }
         
         if (instance == horizontalScrollBar)

            }
            if (!isNaN(hspDelta))
            {
                viewport.horizontalScrollPosition += hspDelta;
                event.stopPropagation();
            }
        }

     */
    override protected function keyDownHandler(event:KeyboardEvent):void
    {
        var vp:IViewport = viewport;
    	if (!vp)
    	    return;
    	    
        // TBD: is special handling for textfields needed here, as in mx.core.Container?
    
        if (verticalScrollBar && verticalScrollBar.visible)
        {
        	var vspDelta:Number = NaN;
