Adding a new checkIn policy for VS2008 in Windows 7

Hi,

I have created a CheckIn policy using Visual C# 2008 and i am trying to add it to VS2008 checkIn policies in Windows 7. I have created a key(CheckForCommentsPolicy) in  HKEY_LOCAL_MACHINE\SOFTWARE\Microsoft\VisualStudio\9.0\TeamFoundation\SourceControl\Checkin Policies and added value <dll path>\CheckForCommentsPolicy.dll.After i opened VS2008 and i cant find newly added policy in the source control!.I added same toHKEY_CURRENT_USER\Software\Microsoft\VisualStudio\11.0_Config\TeamFoundation\SourceControl\Checkin Policies  and HKEY_LOCAL_MACHINE\SOFTWARE\Microsoft\VisualStudio\11.0\TeamFoundation\SourceControl\Checkin Policies  and its working in VS2012.Why its not working in VS2008?anything i am missing?

EDIT:

 I found out that i had referenced a new version of  Microsoft.TeamFoundation.VersionControl.Client.dll file.So i added reference to same version of .dll.Now checkIn policy is visible in list but while adding some internal error occuring.

Why this is happening?

Thank you