title: Enable Multi check out files at TFS
body: <p>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 option for multi check out?
  When one uses "check out for edit", the combo box of "Lock Type" said that only one can edit file and there is no option to change it.</p>