title: Edmx file is not under TFS source control VS2012
body: <p>I was having some issue with a relationship not showing up in an the Model Browser for a table. So I deleted it in the EDMX diagram and added it back.</p>
  
  <p>Now I noticed when Checking In Pending Changes, that this same file was marked for deletion and that it is missing the source control padlock icon next to it. </p>
  
  <p><a href="https://i.stack.imgur.com/2NY7G.png" rel="nofollow noreferrer"><img src="https://i.stack.imgur.com/2NY7G.png" alt="enter image description here"></a>
   1. I tried <code>File &gt; Source Control &gt; Advanced &gt; Refresh Status</code> to no
     avail.<br>
   2. The rest of the project is fine...just this one file, so the
     source control Bindings check is all ok.
   3. I went up to the EDMX file and <code>r-click &gt; Add files to source control</code>..again no luck.</p>
  
  <p>Is there anyway to add this to source control again? </p>