access methods and variables in first navigation controller from pushed view

I normally use UIViews to make my apps - but this one I am using a navigationcontroller. I am pushing a view to the top where I want to add items to an array. However, I cannot access the main navigation controller methods etc. Here's the set up

1) AppDelegate adds navigation controller

[window addSubview:navigationController.view];

2) In RootViewController I push a new UIView

AddNewViewController *addNewViewController = [[AddNewViewController alloc] init];
[self presentModalViewController: addNewViewController animated:YES];

3) From the AddNewViewController I then want to access the main RootViewController - but cannot seem to access anything. All the methods etc are declared as I've done it before (using UIViews). This code cannot find anything in the RootViewController.

AppDelegate *appDelegate = (AppDelegate *)[[UIApplication sharedApplication] delegate];
[appDelegate.navigationController myFunction];

I have myFunction in the RootViewController.h file. I have used this method before, but never with a navigation controller. I guess it's something to do with hte stack - but I cannot find out what I've done wrong!

Help is much appreciated!!

* UPDATE *

I have now used

AddNewViewController *addNewViewController = [[AddNewViewController alloc] init];
[self.navigationController pushViewController:addNewViewController animated:YES];

to push the view controller. In my code, I am trying to access the tableview to reload it with the following code

[self.navigationController.mainTableView reloadData];   

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but the mainTableView is not accessible. I have declared and sync'd it but still cannot see it. I also tried to loop through and use the element[0] of the stack (as below) but didn't get anywhere with that either!

NSArray *controllers = [[NSArray alloc] initWithObjects:self.navigationController.viewControllers, nil];

UIViewController *tmpController = [[UIViewController alloc] init];
tmpController = [controllers objectAtIndex:0];

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First of all,

[self presentModalViewController: addNewViewController animated:YES];

does something different than

[self.navigationController pushViewController:addNewViewController animated:YES];

The names of those methods should speak for themselves.

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And appDelegate.navigationController is not your rootViewController. It is the UINavigationController. You can get an NSArray of viewControllers attached to the navigationcontroller with self.navigationController.viewControllers. Item at index 0 should be your rootViewController.

If you push the viewController on the navigationControllers stack there is no need to use the appdelegate. You can access the navigationController with self.navigationController.