Hi,
Sorry for some misunderstanding, our test environment is Visual Studio 2012 and TFS 2012.
We add a C# WPF project into the TFS 2012, and one team member check out one .cs file, ( a tick icon will appear beside this file)
However, other members still see a lock icon beside the file from their Visual Studio environment ( it should be a man icon, means it is used by someone else. But it is still a lock icon, means it is not used by anyone. )
Our Visual Studio 2012 detail environment is Microsoft Visual Studio Ultimate 2012 Version 11.0.5.727.1 RTMREL
Our TFS 2012 detail environmemt is Team Foundation Server 2012 (51106.01)
Regards,