How to push a ABPeoplePickerNavigationController?

I am having some trouble while using ABPeoplePickerNavigationController. I am developing an ipad application. I wanted to push ABPeoplePickerNavigationController to my navigation controller hierarchy. I kn开发者_如何学Pythonow how to extract viewcontroller from a navigation controller, it is not working with ABPeoplePickerNavigationController!!! Please help me out!! Thanks in advance!!

You can't push a navigation controller onto an existing navigation controller stack. You can, however show it modally, using an animation to change between your app's navigation stack to the people picker one.