New UIWindow Won't Display - ios

Question

I am trying to create a new UIWindow to cover the entire screen, including the status bar. I get it to appear when a button is pressed but it just quickly flashes on the screen and goes away. What am I doing wrong?
MenuTableViewController *menu = [[MenuTableViewController alloc]initWithNibName:#"MenuTableViewController" bundle:nil];
UIWindow *menuWindow = [[UIWindow alloc]initWithFrame:[[UIScreen mainScreen]bounds]];
menuWindow.backgroundColor = [UIColor clearColor];
menuWindow.windowLevel = UIWindowLevelStatusBar;
menuWindow.rootViewController = menu;
[menuWindow addSubview:menu.view];
[menuWindow makeKeyAndVisible];
menuWindow.hidden = NO;

Answer 1

I got it working by adding #property (nonatomic, strong) UIWindow *menuWindow; to my header file. Here is what my showMenu and closeMenu methods look like.
- (void)showMenu
{
CGRect screenRect = [[UIScreen mainScreen] bounds];
CGFloat screenWidth = screenRect.size.width;
CGFloat screenHeight = screenRect.size.height;
UIButton *closeMenuButton = [UIButton buttonWithType:UIButtonTypeCustom];
[closeMenuButton setFrame:CGRectMake(250, 10, 50, 50)];
[closeMenuButton setImage:[UIImage imageNamed:#"close"] forState:UIControlStateNormal];
[closeMenuButton addTarget:self action:#selector(closeMenu) forControlEvents:UIControlEventTouchUpInside];
blurredView = [[UIToolbar alloc]initWithFrame:CGRectMake(0, 0, screenWidth, screenHeight)];
[blurredView setBarStyle:UIBarStyleBlack];
MenuTableViewController *menu = [[MenuTableViewController alloc]initWithNibName:#"MenuTableViewController" bundle:nil];
menu.view.frame = CGRectMake(0, 30, screenWidth, screenHeight - 50);
menuWindow = [[UIWindow alloc]initWithFrame:[[UIScreen mainScreen]bounds]];
menuWindow.backgroundColor = [UIColor clearColor];
menuWindow.windowLevel = UIWindowLevelStatusBar;
menuWindow.rootViewController = menu;
[menuWindow addSubview:blurredView];
[blurredView addSubview:closeMenuButton];
[blurredView addSubview:menu.view];
[menuWindow makeKeyAndVisible];
}
- (void)closeMenu
{
menuWindow.hidden = YES;
menuWindow = nil;
}