iphone - How to place tab bar on top of the view -

i'm developing iphone app want place tab bar on top.

here code

tabbarcontroller = [[uitabbarcontroller alloc]init];     tabbarcontroller.view.frame= cgrectmake(0, 0, 320, 40);     nsarray *arr = [[nsarray alloc]initwithobjects:[[demoview alloc] init], [[demoview alloc] init], nil];     tabbarcontroller.viewcontrollers = arr;      [tabbarcontroller.view setbackgroundcolor:[uicolor whitecolor]];      [self.view addsubview:tabbarcontroller.tabbar]; 

but cant see tab bar. don't problem is.

thanks

you dont have take view add tabbar. can directly add window