Developing a NavigationBar Based application including one Open GL View : How?

OpenGlViewController *glvController;

if (glvController == nil)
	{
		glvController = [[OpenGlViewController alloc] initWithNibName:@"Gl View" bundle:nil];
		glvController.title = @"GL View";
	}
[self.navigationController pushViewController:glvController animated:YES];

- (void)loadView {
OpenGlView * view;
view = [[OpenGlView alloc] initWithFrame:[[UIScreen mainScreen] applicationFrame]];
self.view = view;
[view release];