title: Structuremap - Override registration
body: <p>Is it possible to register an interface in a registry, then "re-register" it to override the first registration?</p>
  
  <p>I.E.:</p>
  
  <pre><code>For&lt;ISomeInterface&gt;().Use&lt;SomeClass&gt;();
  For&lt;ISomeInterface&gt;().Use&lt;SomeClassExtension&gt;();
  </code></pre>
  
  <p>What I want here on runtime is that my object factory returns <code>SomeClassExtension</code> when I ask for <code>ISomeInterface</code>.</p>
  
  <p>Thanks in advance!</p>