     [Inspectable(category="General")]
 
     /**
-     *  The vertical space between layout elements.
+     *  The vertical space between layout elements, in pixels.
      * 
      *  Note that the gap is only applied between layout elements, so if there's
      *  just one element, the gap has no effect on the layout.


    /**
     *  If <code>variableRowHeight</code> is <code>false</code>, then 
     *  this property specifies the actual height of each child.
     * 
     *  <p>If <code>variableRowHeight</code> is <code>true</code>, 
     *  the default, then this property has no effect.</p>

    public function VerticalLayout():void
    {
        super();
        
        // Don't drag-scroll in the horizontal direction
        dragScrollRegionSizeHorizontal = 0;
        
        // Virtualization defaults for cases
        // where there are no items and no typical item.
