             currentView = currentViewDescriptor.instance;
             currentView.setActive(false);
             
-            // Need to validateNow() to make sure our old screen is currently 
-            // up to date before starting the transition and possibly storing a bitmap 
-            // for the transition
+            // In most cases this is a No-Op because this method is called in response
+            // to UPDATE_COMPLETE on the navigator and there should be no objects
+            // in the LayoutManager's queue.  It's only here to ensure that the
+            // current view is up to date incase anything changed.
             currentView.validateNow();
         }
         

            
            activeTransition = transitionsEnabled ? pendingViewTransition : null;
            
            // Force a validation of the navigator so that all validation events are
            // dispatched to the developer before preparing the view transition.
            validateNow();
            
            // Prepare the view transition
            prepareViewTransition();
        }
        
        pendingViewTransition = null;

     *  instance of the new view is added to the display list.  It initializes
     *  the underlying ViewDescriptor object and prepares the transition.
     * 
     *  Called after the UPDATE_COMPLETE event is received on the navigator
     *  after the pendingView is added to the display list.  
     *  See commitNavigatorAction.
     * 
     *  @langversion 3.0
     *  @playerversion AIR 2.5
     *  @productversion Flex 4.5
     */
    private function prepareViewTransition(event:Event):void
    {
        removeEventListener(FlexEvent.UPDATE_COMPLETE, prepareViewTransition);
        
        var currentView:View;
        var pendingView:View;
        
