Xcode4 Where is the Tab Bar Controller

Hello,
I am learning Xcode4 now and I am trying to build a Tab bar & Nav bar combined app. There is a great video tutorial about how to do it in Xcode 3.~, but when I try to do the same in Xcode4, I get stuck because I do not find the "Tab Bar Controller" allowing me to change the type of view controllers. Opening the same project in Xcode3 is working like a charm.
Does anyone has the same problem? Sorry, this might be a pretty dumb question, as I'm a newbe!!
The Xcode 3.xx tutorial
http://www.youtube.com/watch?v=LBnPfAtswgw
The Tab Bar Controller in Xcode3
http://eremiya.net/share/xcode4-tabbarcontroller.png

I think I have found a solution.
Instead of going about as you would in Xcode 3 and in the video, you follow these steps:
Select the view controller that you wish to change to a navigation controller - This can be done by either selecting the view controller under the 'objects' section of the expanded dock on the left hand side, or selecting the tab bar button that relates to the view controller
In the Identity Inspector, change the 'Class' drop down menu (under the 'Custom Class' header) to 'UINavigationController'
That should work
null

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    1   libobjc.A.dylib                     0x0157c313 objc_exception_throw + 44
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