gistfile1.m

         /*
         iOS5 UIViewControllers introduced API changes with the parentViewController.
         I'm not 100% clear why this needs to be break existing code:
         calling parentViewController the second time on a UINavigationController returns nil.
         For instance to insert controllers to a bottom navigationtion stack.
         So instead simply call presentingViewController to get the bottom UINavigationController.

         */
        if ([self respondsToSelector:@selector(presentingViewController)])
        {
            UINavigationController*parent = (UINavigationController*) self.presentingViewController;
            NSMutableArray* controllers = [[[parent viewControllers] mutableCopy] autorelease];
            
            CPVenueDetailViewController *aRestaurantDetailController = [[CPVenueDetailViewController alloc]initWithNibName:nil
                                                                                                                    bundle:nil];
            aRestaurantDetailController.venue = (CPVenue*)annotation;
            
            [controllers addObject:aRestaurantDetailController];
            [parent setViewControllers:controllers];
            [self.parentViewController dismissModalViewControllerAnimated:NO];
            [aRestaurantDetailController release];
        }
        else
        {
            UINavigationController *parent = (UINavigationController*) 
                [(UINavigationController*)self.parentViewController parentViewController];
            NSMutableArray* controllers = [[[parent viewControllers] mutableCopy] autorelease];

            CPVenueDetailViewController *aRestaurantDetailController = [[CPVenueDetailViewController alloc]initWithNibName:nil
                                                                                                                    bundle:nil];
            aRestaurantDetailController.venue = (CPVenue*)annotation;

            [controllers addObject:aRestaurantDetailController];
            [parent setViewControllers:controllers];
            [self.parentViewController dismissModalViewControllerAnimated:NO];
            [aRestaurantDetailController release];
        }