Enable Multi check out files at TFS

Question

I use TFS 2010 with a small team. The policy of check out files does not enable multi check out. But I want that for specific files (only for two files (cs files)) there is

Answer 1

As Mike Edenfield sayd you can enable Multiple Check-Outs in the Team Project Settings :
(project) -> Team Project Settings -> Source Control -> Checkout Settings and toggle on the "Allow Multiple Check-Outs" box.
But it's not enougth:
In (project) -> Team Project Collection Settings -> Source Control, for each file type you want, enable merging, else TFS will lock the file on checkout.