UITabBarController *tabBarCtr = [[UITabBarController alloc]init];
SecondViewController *secondViewCtrl1=[[SecondViewController alloc]init];
UINavigationController *navCtrl1=[[UINavigationController alloc]initWithRootViewController:secondViewCtrl1];
[secondViewCtrl1 release];
TabBarViewController *secondViewCtrl2=[[TabBarViewController alloc]init];
UINavigationController *navCtrl2=[[UINavigationController alloc]initWithRootViewController:secondViewCtrl2];
[secondViewCtrl2 release];
NSArray *array=[NSArray arrayWithObjects:navCtrl1,navCtrl2,nil];
tabBarCtr.viewControllers=array;
[self presentModalViewController:tabBarCtr animated:YES];