title: MEF Add module twice to catalog
body: <p>Do you know how to add the same module twice to a catalog with different parameters?<br /></p>
  
  <pre><code>ITest acc1 = new smalltest("a", 0)
  ITest acc2 = new smalltest("b", 1)
  
  AggregateCatalog.Catalogs.Add(??)
  AggregateCatalog.Catalogs.Add(??)
  </code></pre>
  
  <p>Thanks in advance!</p>