XCode 4数据模型版本错误?

Installed Xcode 4 and it all seems fine... except, when I try to add versioning to a Core Data model. In the instructions it says I should select the data model in the navigator and then "Choose Editor > Convert to Versioned Model." Well, the "Editor" menu does not have an item "Convert to Versioned Model"!!! Skipping this step crashes XCode 4. Also, I can't believe that there is no support for XCode 4 now that it is a pay product! Any ideas? Installed Xcode 4 and it all seems fine... exce