title: Cannot set the compiler flags in Xcode 4.3.3
body: <p>I am trying to set compiler flags to disable arc for some of the files and i am not getting the dialog box when i double click or press enter on one of the files.  It happens in a new project and old where i already set the compiler flags before.  All it does just becomes gray after i press enter and looses focus.  Is any one else having same issue or could i be doing something wrong.</p>
  
  <p>Thanks!</p>