Move from navigationcontroller to tabbarcontroller and to other views of tabbarcontro

[appdevelop]

Hi, I have a UITableViewController, and double clicking on the table cells I am loading a custom tabbar controller. All my tabbar items will have hierarchy of views. My problem is that I am not able to push, on the custom tabbar items another uiview. I get self.navigationcontroller as null in my custom tabbarviewcontroller although I am able to get the proper value of self.navigationcontroller in my UITableViewController. Also I am able to view the navigationbar title on my tabbaritem view, but then why am I not able to push another view on that? Can anybody please help me out, below is my code.

MyTableViewController(this is the controller where I can get the value self.navigationcontroller),

- (void)viewDidLoad {

  //Initializing Custom Tabbar controller that has 2 other tabbar views

    UITransTabViewController *transtvController = [[UITransTabViewController alloc] initWithNibName:@"TransTabViewController" bundle:nil];

    self.transtabViewController = transtvController;    

    [transtvController release];
}

- (void)tableView:(UITableView *)tableView
didSelectRowAtIndexPath:(NSIndexPath *)indexPath {


    NSUInteger row = [indexPath row];

    //This does push the custom tabbar controller onto the UITableViewController

    if(row==0){
        [self.navigationController pushViewController:self.transtabViewController animated:YES];
    }   
}

UITransTabViewController code(this is my custom tabbar controller),

- (id)initWithNibName:(NSString *)nibNameOrNil bundle:(NSBundle *)nibBundleOrNil {

    if (self = [super initWithNibName:nibNameOrNil bundle:nibBundleOrNil]) {

        // Custom initialization of my two tab items on the tabbar controller
        ArrivalsTabViewController *arrTabViewController = [[ArrivalsTabViewController alloc] initWithNibName:@"Arrivals" bundle:nil];

        DeparturesTabViewController *depTabViewController = [[DeparturesTabViewController alloc] initWithNibName:@"Departures" bundle:nil];


        NSArray *array = [[NSArray alloc] initWithObjects:arrTabViewController, depTabViewController, nil];
        self.viewControllers = array;

        [self.view addSubview:arrTabViewController.view];
        self.selectedViewController = depTabViewController;

        [array release];
        [arrTabViewController release];
        [depTabViewController release];

    }
    return self;
}


- (void)viewDidLoad {
    NSLog(@"MY NAV CONTROLLER IN TRANSTABVIEWCONTROLLER IS = %@", self.navigationController);

    if (self.navigationController == nil) 
        NSLog(@"navigation is nil");
    if (self.parentViewController.navigationController == nil)
        NSLog(@"parent navigation is nil"); 

        //here i get both navigation and parent navigation as nil..

    tabBar.selectedItem = arrivalsTabBarItem;   
    [super viewDidLoad];
}



- (void)tabBar:(UITabBar *)tabBar didSelectItem:(UITabBarItem *)item
{
    if (item == arrivalsTabBarItem) {

        UIViewController *arrViewController = [viewControllers objectAtIndex:0];
        [self.selectedViewController.view removeFromSuperview];
        [self.view addSubview:arrViewController.view];
        self.selectedViewController = arrViewController;        

    } else if (item == departuresTabBarItem) {
        UIViewController *depViewController = [viewControllers objectAtIndex:1];
        [self.selectedViewController.view removeFromSuperview];
        [self.view addSubview:depViewController.view];
        self.selectedViewController = depViewController;
    }
}

I have a button in my ArrivalsTabViewController which is the first tab item in my custom controller,

- (IBAction)findArrivals:(id)sender {   

    MyViewController *myController=
    [[MyViewController alloc]initWithNibName:@"MyView" bundle:[NSBundle mainBundle]];
    self.hidesBottomBarWhenPushed = YES;    


    [self.navigationController pushViewController:myController animated:YES]; 
    [myController release];

}

On click of the button, I am not able to push myController on the tabbar item view. Please let me know if I have not made my self clear enough.