title: The diff tool in Visual Studio when using the Git Plugin
body: <p>Microsoft has released a <a href="http://visualstudiogallery.msdn.microsoft.com/63a7e40d-4d71-4fbb-a23b-d262124b8f4c">Git plugin for Visual Studio 2012</a>.  I have found it to be excellent, but there doesn't seem to be any option to change the default Diff tool.  Worse, I cannot do a diff at all on ascx codebehind files.  It only shows a diff option for the main .ASCX file.</p>
  
  <p>How do you</p>
  
  <ol>
  <li>Diff the codebehind files when using the git plugin?</li>
  <li>Change the diff tool?</li>
  </ol>