Tapping CalloutAccessoryView to load detail View Controller

Question

I have added a CalloutAccessoryView to my Pin Callout, and when i tap it, although my detail view is created, and the pushViewController:animated method is called, the view does not appear, and stays on the map view.

My rootController is a UITabBarController, and i have a reference to my navigation controller in the app delegate, so call this code:

[appDelegate.navController pushViewController:detailViewController animated:YES]

What have i missed?

Thanks