title: VS 2013 : Add Existing Project does not physically copy files. How do you do that?
body: <p>I have created a new Class Library where I add a lot of existing projects so that I can create one <code>.dll</code> which I reference to use these classes in multiple solutions.
  I added all the projects using as <code>Add Existing Project</code> and created my Class Library Solution. 
  Now I see that the files have not actually been copied to the new Class Library location but as present as links. </p>
  
  <p>How to I trigger a copy?</p>