Where is the Class Model in Xcode 4? [closed]

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Anyone knows where the hell are the Class Models in Xcode 4? Or the Xcode 4 GM seed doesn't implemented this feature yet?

I'm going crazy with this!

In Xcode 3 was so simple. Design -> Class Model -> Quick Model! But now in Xcode 4... God Dammit!

So, anyone knows?