Enable source control extension on isolated shell

Hi,

We are developing an isolated shell and whould like users to be able to install a source control extension like TFS or Ankh SVN.

I tried to install Team Foundation Server 2012 MSSCCI Provider which adds the Team Foundation Server to the providers list (in Options -> Source Control) but when I select it, it jumps back to "None"

How can we enable this in the isolated shell?

Thanks, 

Avigail