Programmatically created UIBarButtonItem Not Launching Selector Action

Here is my UIBarButton:

[self.navigationItem setLeftBarButtonItem:[[UIBarButtonItem alloc] 
                            initWithTitle:@"+ Contact" 
                                    style:UIBarButtonItemStylePlain 
                                   target:nil 
                                   action:@selector(showPicker:)] animated:YES];

Here is the code it's supposed to launch:

- (void)showPicker:(id)sender {
    ABPeoplePickerNavigationController *picker = 
     [[ABPeoplePickerNavigationController alloc] init];
    picker.peoplePickerDelegate = self;

    [self presentModalViewController:picker animated:YES];
    [picker release];
}

When I launch the app and click on the '+ Contact' UIBarButton, nothing happens. No errors, nada. I put in a breakpoint, and it never reaches the method referenced by the selector.

Am I doing something wrong in the way I'm calling the selector?

Thanks!