How to display a new view from a nib ?

Question

how to
display a new view from a nib in the main window after clicking on a button.
When I click a the button named for example "goToGokyo", the link to my procedure
runs correctly because I see my NSLog message "goToGokyo button pressed".
My nib, which name is "GokyoViewController" does exist.
I did as follow for the moment but I'm stuck now, my nib  :
- (IBAction)goToGokyo:(id)sender
    NSLog(@"goToGokyo button pressed");
  //[self stopSound];
  if (gokyoViewController == nil)
        GokyoViewController *aGokyoViewController = [[GokyoViewController alloc]
                                                     initWithNibName:@"GokyoViewController" bundle:nil];
        self.gokyoViewController = aGokyoViewController;
        //[aGokyoViewController release];
    [self GokyoView:gokyoViewController animated:YES completion: nil];
Thanks in advance for your advice.
Cheers

Answer 1

I did that now :
- (IBAction)btnLoadMyViewController:(id)sender
    NSViewController *viewController = [[NSViewController alloc] initWithNibName:@"MyView" bundle:nil];
    NSView *view = [viewController view];
    [_myWindowController.window setContentView:view];
    //view addSubview:view];
    //[self.myView addSubview:view];
Using
"_myWindowController.window setContentView:view];"
or
"[self.myView addSubview:view];"
does not an error but does nothing !
Would you help me one more times please ?
Thanks in advance