iPhone: Xcode 4.1 doesn't show up Distribution build configuration

I developed an iPhone application and want to use Distribution scheme to build and upload to App store. I recently updated Xcode 4.1. When i search for Distribution setting build configuration, it doesn't show up. It shows onl开发者_如何学JAVAy Release and Debug.

Could someone help me to get this?

Thank you!

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Check it out Build configuration for Distribution