title: MEF VS Unity - dependency resolving at runtime
body: <p>I've been comparing Unity and MEF (to be used in Prism) and was going towards MEF. Alas, recently I saw Unity's cool runtime dependency resolving - If I want to add a module, I should just add its <code>view</code> type using <code>ServiceLocator</code> and, if I have a dependency constructor stating the <code>view model</code>, Unity will initialize it for me, along with the VM's dependencies (in other services and modules).  </p>
  
  <p>Is this kind of behavior supported in MEF?  </p>
  
  <p>Thanks.</p>