XCode4.6 Adding Navigation controller in Tab Bar

Hi All,
Iam a beginner in IOS development.
I have installed XCode4.6 in Mac OS X Lion.
As a part of my project, I started implementing navigation controller in Tab Bar.
So I created a project with template as "Tab Bar Application".
Then I created "FirstView" derived from UIViewController.
Modified the AppDelegate.m as below:
When I run the application, two tabs are displayed: "First" and "MyCutomView"
First is the title of the FirstViewController that the template created by default.
"MyCustomView" is the title of my custom navigation controller.
When I click the tab "MyCustomView" Iam getting the following exception:
In main() ---> @autoreleasepool ---> return statement. The xception message says "Thread 1: SIGNAL SIGABRT"
Is anything Iam doing wrong?
Is this feature not supported in XCode4.6?
Looking forward for your guidance,
Vidhya

Hi,
does the nib-file of ViewController "FirstView" really is called "Navigation Controller"?
Dirk Mika

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    1   libobjc.A.dylib                     0x0157c313 objc_exception_throw + 44
    2   CoreFoundation                      0x0142a0bb -[NSObject(NSObject) doesNotRecognizeSelector:] + 187
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    6   UIKit                               0x003aa0f4 forwardMethod2 + 92
    7   UIKit                               0x003aa0f4 forwardMethod2 + 92
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Any help or direction will not go unappreciated I've scoured the web and this forum for an answer I can understand. I did get bits of code and explanations regarding using:
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