Odd behavior in NSViewController - objective-c

Question

I've started a tiny project to get my head around NSViewControllers.
I have an AppController that handles a NSOpenPanel. Once I get a URL to a movie file, I pass it to a NSViewController subclass (NNMovieViewController). This is how I do it:
-(void)openMovieWithURL:(NSURL *)url {
NSError *error;
movie = [[QTMovie alloc] initWithURL:url error:&error];
[startButton setEnabled:YES];
[movieView setMovie:movie];
NSLog(#"button: %#", [startButton isEnabled]?#"YES":#"NO");
// logs "NO"
NSLog(#"movie: %#", movie);
// logs the correct movie object
NSLog(#"movieView: %#", [movieView movie]);
// logs "(null)"
}
The header file looks like this:
#import <Cocoa/Cocoa.h>
#import <QTKit/QTKit.h>
#interface NNMovieViewController : NSViewController {
QTMovie *movie;
BOOL playing;
IBOutlet QTMovieView *movieView;
IBOutlet NSButton *startButton;
}
-(IBAction)clickStart:(id)sender;
-(void)openMovieWithURL:(NSURL*)url;
#end
What am I missing? I re-did the whole thing in a project without a NSViewController and it just worked...
UPDATE
After I received the comments from Kreiri and Parag Bafna I tinkered a little bit more and found out that at the time I call [movieViewController openMovieWithURL:url]; inside my AppController the Outlets are not hooked up yet.
This is my AppController implementation:
#import "AppController.h"
#implementation AppController
#synthesize movieViewController;
- (void)awakeFromNib {
movieViewController = [[NNMovieViewController alloc] initWithNibName:#"NNMovieViewController" bundle:nil];
NSView *viewControllerView = [movieViewController view];
[view addSubview:viewControllerView];
}
- (IBAction)clickOpen:(id)sender {
NSOpenPanel *dialog = [NSOpenPanel openPanel];
[dialog setCanChooseFiles:TRUE];
[dialog setCanChooseDirectories:FALSE];
[dialog setAllowsMultipleSelection:FALSE];
[dialog setAllowedFileTypes:[QTMovie movieFileTypes:0]];
if ([dialog runModal] == NSOKButton) {
NSURL *movieFileURL = [[dialog URLs] objectAtIndex:0];
[self openMovie:movieFileURL];
}
}
- (void)openMovie:(NSURL *)url {
NSLog(#"startButton: %#", [movieViewController movieView]);
// logs "null"
NSLog(#"startButton: %#", [movieViewController startButton]);
// logs "null"
NSLog(#"---------------------------------");
[movieViewController openMovieWithURL:url];
}
#end

Answer 1

Yes, silly me. In Interface Builder I hooked up my controls with the wrong object. I should have used File's Owner but instead I dragged in an NSObject and set its class to NNMovieViewController and connected the widgets to it.