Unit testing in TFS and/or Resharper

Hi, 

I'd like to do some Unit Testing in my Silverlight 5 application. I created a test project based on the Template from the Silverlight 5 Toolkit. 
When I run the tests through the test application it works fine but when I try to run them within TFS 2010 or resharper it crash everytime I try to create a new EntityManager. 

Note : I am using a FakeEntityManager if that matters, as described in the TempHire application. I tried to instance directly my entityManager and I get the same error

Is there some specific configuration to do in order to be able to run the tests in resharper and/or TFS ? I found an old post about this subject from Ward Bell (from 2009) on this forum but I have to admit I didn't manage to do what he explained. Is this post still up to date ?

Any idea ?

Here is the trace :

System.Exception: Défaillance irrémédiable (Exception de HRESULT : 0x8000FFFF (E_UNEXPECTED))à MS.Internal.XcpImports.CheckHResult(UInt32 hr)
à MS.Internal.XcpImports.Application_GetCurrent(ref IntPtr pApp)
à System.Windows.Application.get_Current()
à IdeaBlade.Core.IdeaBladeConfig.InitializeFromSource()
à IdeaBlade.Core.IdeaBladeConfig.Initialize()
à IdeaBlade.Core.IdeaBladeConfig.get_Instance()
à IdeaBlade.Core.IdeaBladeConfig.AssertNonDefaultVersion(Boolean throwIfDefault)
à IdeaBlade.EntityModel.EntityManager..ctor(EntityManagerContext context)
à IdeaBlade.EntityModel.EntityManager..ctor(Boolean shouldConnect, String dataSourceExtension, EntityServiceOption entityServiceOption, String compositionContextName)
à WSoft.GestionAdministrative.Domain.GestionAdministrativeEntities..ctor(Boolean shouldConnect, String dataSourceExtension, EntityServiceOption entityServiceOption, String compositionContextName)  dans GestionAdministrative.IB.Designer.cs: line 33
à WSoft.GestionAdministrative.Domain.FakeDossierAdministratifEntityManagerProvider.CreateEntityManager() dans FakeDossierAdministratifEntityManagerProvider.cs: line 23
à Cocktail.EntityManagerProviderBase`1.CreateEntityManagerCore() dans EntityManagerProviderBase.cs: line 210
à Cocktail.EntityManagerProviderBase`1.get_Manager() dans EntityManagerProviderBase.cs: line 158
à WSoft.Admissions.Test.Tests.ResetEntityManager() dans Tests.cs: line 31
à WSoft.Admissions.Test.Tests.CreatePatient() dans Tests.cs: line 39
Here is the line where the error occurs :
    public class FakeDossierAdministratifEntityManagerProvider : FakeStoreEntityManagerProviderBase<GestionAdministrativeEntities>
    {
        protected override GestionAdministrativeEntities CreateEntityManager()
        {
=>>       return new GestionAdministrativeEntities(compositionContextName: GestionAdministrativeContextResolver.DossierAdmministratifFake.Name);
        }
    }

Regards,