title: Adding foreign key in visual studio 2012
body: <p>I'm developing my first MVC project in Visual Studio 2012. Because i prefer "database first" approach i've started to design database.
  The question is:
  Why when i want to add foreign key i have all key properties disabled to edit (left):</p>
  
  <p><img src="https://i.stack.imgur.com/Au1vv.png" alt="enter image description here"></p>
  
  <p>I can only modify script directly (right) but is this really only solution?
  Or i did something wrong?</p>
  
  <p>Thanks for any help.</p>