     private var _firstViewData:Object;
     
     /**
-     * This is the initialization data to pass to the first view when the
-     * navigator is initialized.
+     *  The Object to pass to the <code>data</code> property 
+     *  of the first view when the navigator is initialized.
+     *  Specify the first view by using the <code>firstView</code> property.   
      * 
      *  @default null
-     * 
-     *  @langversion 3.0
-     *  @playerversion Flash 10.1
+     *
+     *  @see #firstView
+     *  @see View
+     * 
+     *  @langversion 3.0
+     *  @playerversion Flash 10
      *  @playerversion AIR 2.5
      *  @productversion Flex 4.5
      */

    /**
     *  Shows the action bar.
     * 
     *  @param animate Indicates whether a show effect should be played.
     * 
     *  @langversion 3.0
     *  @playerversion Flash 10.1
     *  @playerversion AIR 2.5
     *  @productversion Flex 4.5
     */

    }

    /**
     *  Replaces the top view of the navigation stack with a new view.
     *  The view replacing the current view on the stack becomes the current view. 
     * 
     *  @param viewClass The class used to create the replacement view.
     *  This argument must reference a class that extends View container.
     *  
     *  @param data The data object to pass to the view. 
     *  This argument is written to the <code>data</code> property of the new view.
     *  
     *  @param context An arbitrary object used to describe the context
     *         of the push.  When the new view is created, it can
     *         reference this property.
     *  
     *  @param transition The view transition to play while switching views.    
     * 
     *  @langversion 3.0
     *  @playerversion Flash 10
     *  @playerversion AIR 2.5
     *  @productversion Flex 4.5
     */
