ios - Present UIPopoverController with navigation controller -

i attempting present uipopovercontroller similar bookmark selector in safari title above , ability go , forward. found tutorial: http://mobiforge.com/designing/story/using-popoverview-ipad-app-development , have followed it, yet navigation bar not appearing should be. instead, appearing recessed in popover controller , not part of popover controller. below code have far. appreciated.

code:

- (ibaction)addapreplan:(id)sender {     if (![self.preplanpopovercontroller ispopovervisible]) {          // initiate popover controller         uitableviewcontroller *pp = [[uitableviewcontroller alloc] init];         pp.navigationitem.title = @"add preplan";         uinavigationcontroller *nav = [[uinavigationcontroller alloc] initwithrootviewcontroller:pp];         uipopovercontroller *popover = [[uipopovercontroller alloc] initwithcontentviewcontroller:nav];         popover.delegate = self;         self.preplanpopovercontroller = popover;     }     else {          // dissmiss popover         [self.preplanpopovercontroller dismisspopoveranimated:yes];     }      // present popover controller     [self.preplanpopovercontroller presentpopoverfrombarbuttonitem:self.addapreplanbutton permittedarrowdirections:uipopoverarrowdirectionany animated:yes]; }