      *  transition animation.
      * 
      *  @default Sine(.5);
+     *
+     *  @see spark.effects.easing
      * 
      *  @langversion 3.0
      *  @playerversion AIR 2.5

    private var _startView:View;
    
    /**
     *  Reference to the currently active view of the view navigator, 
     *  set by the owning view navigator. 
     *  This property can be null.
     * 
     *  @langversion 3.0


/**
 *  Dispatched when the transition starts.
 * 
 *  @eventType mx.events.FlexEvent.TRANSITION_START
 *  
 *  @langversion 3.0
 *  @playerversion AIR 2.5
