Tab bar as subview of view controller's top-level view; not drawn correctly

I have a tab bar controller that I have created programmatically, named TPastJourneyTabbar. When I click on the table view and didSelectRowAtIndexPath: is called, my tab bar class should get allocated and it should get added as subview of another class. I have done开发者_JAVA技巧 this using the follwing code:

- (void)tableView:(UITableView *)tableView didSelectRowAtIndexPath:(NSIndexPath *)indexPath {
    [tableView deselectRowAtIndexPath:indexPath animated:YES];
    TPastJourneyTabBar * tabbar = [[TPastJourneyTabBar alloc]init];

    HGMovingAnnotationSampleViewController *detailViewController = [[HGMovingAnnotationSampleViewController alloc] initWithNibName:@"HGMovingAnnotationSampleViewController" bundle:nil];
    [detailViewController.view addSubview:tabbar.view];
    [self.navigationController pushViewController:detailViewController animated:YES];

    [detailViewController release];

}

HGMovingAnnotationSampleViewController is the class to which I am adding my tab bar as a subview. When I run my application, the tab bar is getting called but it is not getting called completely; i.e., the lower portion of the tab bar, where the title of the tab bar item is written, is not seen. How can I make the tab bar completely visible?

You have a design problem here. You shouldn't use a TabBar as a subview of nothing than the AppDelegate's window, as the Human Interface Guidelines states.