How to change App Delegate type in IB?

I want to change the App Delegate Type in MainWindow.xib through IB, beacause I have to modify the application name of the existing project with different name. I have changed the app delegate .h/.m files in the source code,only App Delegate Type not able to modify. The screen shot of MainWindow.xib is attached belo开发者_C百科w.

Open the inspector and you can change the object's class when it is selected. The class info is in the identity inspector tab (on Xcode 4, but it must be the same for Xcode 3)

You can use "_" in place of "-" as IT_transJKAppDelegate.