Novice: didFinishLaunchingWithOptions manually add button is not displayed

I was xcode 4.6, in didFinishLaunchingWithOptions want to manually add the button, but the button is not displayed. I ask you: In this function can manually add button? If you can add, you have what needs attention? ? ?

 - (BOOL) application: (UIApplication *) application didFinishLaunchingWithOptions: (NSDictionary *) launchOptions 
{
self.window = [[[UIWindow alloc] initWithFrame: [[UIScreen mainScreen] bounds]] autorelease]; 
/ / Override point for customization after application launch. 
self.viewController = [[[FQViewController alloc] initWithNibName: @ "FQViewController" bundle: nil] autorelease]; 
self.window.rootViewController = self.viewController; 

[Self.window makeKeyAndVisible]; 

/ / Here the button is not displayed, the trouble you help look where the problem lies. I'm a beginner, not sure 
UIButton * button = [UIButton buttonWithType: UIButtonTypeRoundedRect]; 
[Button setTitle: @ "Click" forState: UIControlStateNormal]; 
[Button setTag: 100]; 
[Button setFrame: CGRectMake (30, 40, 60, 40)]; 

[Self.window addSubview: (UIView *) button]; 
[Button release]; 

/ / Add the view can be displayed here 
/ / UIView * view = [[UIView alloc] initWithFrame: CGRectMake (40, 50, 60, 60)]; 
/ / View.backgroundColor = [UIColor redColor]; 
/ / [Self.window addSubview: view]; 
/ / [View release]; 

return YES; 

}
Reply:
I know, the button release to remove the line
Reply:
Or it with ARC