You might face the same issue as I faced today. I was trying to generate an Entity Data Model using the wizard and the code file was almost empty. So I was not able to implement that model to display the records.
This is a known issue and the fix is available at Microsoft. Please go ahead and download the fix from http://www.microsoft.com/downloads/details.aspx?FamilyID=f69e9eb8-0ebd-4fba-a4cc-2050297ba75b&DisplayLang=en and enjoy the feature.