How to use iPhone with iOS 5 for development?

I have upgraded my iPhone 开发者_JAVA百科Os to iOS 5 and now it doesn't appear in Xcode-4.0.2 devices list. I can't use it as development phone. XCode organizer tells me to downgrade OS to 4.3! Still I am able to sync App using latest itunes 10.5 but not able to debug my app. Could anyone please tell me what should I do? Is there anyway to use iPhone with iOS 5 as Development phone?

Thanks.

---

Upgrade to Xcode 4.2, which can be found at developer.apple.com.