      *  Constructor.
      *  
      *  @langversion 3.0
-     *  @playerversion Flash 10
      *  @playerversion AIR 2.5
      *  @productversion Flex 4.5
      */

     */
    private var borderSize:uint;
    
    protected var layoutShadowHeight:uint;
    
    protected var layoutContentGroupHeight:uint;
    
    protected var layoutTitleGroupHorizontalPadding:uint;
    
    //--------------------------------------------------------------------------

    //
    //--------------------------------------------------------------------------
    
    /**
     *  @copy spark.components.ActionBar#navigationGroup
     */
    public var navigationGroup:Group;
    
    /**
     *  @copy spark.components.ActionBar#titleGroup
     */
    public var titleGroup:Group;
    
    /**
     *  @copy spark.components.ActionBar#actionGroup
     */
    public var actionGroup:Group;
    
    /**
     *  @copy spark.components.ActionBar#titleDisplay
     * 
     *  @private
     *  Wraps a StyleableTextField in a UIComponent to be compatible with
     *  ViewTransition effects.
     */
