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Dynamically declare child UiViewController in main UiViewController
//--Child-------------------------------------------------------------------
@interface subUIViewController<UIViewController>

     -(IBAction)myButtonClick:(id)Sender;

-@implementation subUiViewController

     -(IBAction)myButtonClick:(id)Sender
     {
          NSLog(@"Button Click Event.....");
     }

//---Main--------------------------------------------------------------------

@interface mainUIViewController<UIViewController>

@implementation mainUIViewController

     -(void)viewDidLoad
     {
          [super viewDidLoad];
          subUiViewController *subViewController=[[subUiViewController alloc] initWithNibNameAndArtist:@"subUiViewController" bundle:nil];
          [self.view addSubView: subViewController.view];
     }

//---------------------------------------------------------------------------
//---------------------------------------------------------------------------

//---Child------------------------------------------------------------------
@interface subUIViewController<UIViewController>

     -(IBAction)myButtonClick:(id)Sender;

@implementation subUiViewController

     -(IBAction)myButtonClick:(id)Sender
     {
          NSLog(@"Button Click Event.....");
     }

//----Main-----------------------------------------------------------------


@interface mainUIViewController<UIViewController>
     @property(retain,nonatomic) subUiViewController *subViewController;

@implementation mainUIViewController
     @synthesize subViewController;

     -(void)viewDidLoad
     {
          [super viewDidLoad];
          subViewController=[[subUiViewController alloc] initWithNibNameAndArtist:@"subUiViewController" bundle:nil];
          [self.view addSubView: subViewController.view];
     }


//---------------------------------------------------------------------------
//---------------------------------------------------------------------------

@interface mainUIViewController<UIViewController>
     @property(retain,nonatomic) NSMutableArray *myViewControllers;

@implementation mainUIViewController
     @synthesize myViewControllers;

     -(void)viewDidLoad
     {
          [super viewDidLoad];

          //Sub View Controller 1
          subUiViewController *subViewController1=[[subUiViewController alloc] initWithNibName:@"subUiViewController" bundle:nil];
          [self.myViewControllers addObject:subViewController1];
          [self.view addSubView: subViewController1.view];

          //Sub View Controller 2
          subUiViewController *subViewController2=[[subUiViewController alloc] initWithNibName:@"subUiViewController" bundle:nil];
          [self.myViewControllers addObject:subViewController2];
          [self.view addSubView: subViewController2.view];
     }

subUiViewController *subViewController

addChildViewController: