title: Microsoft.VisualStudio.PlatformUI missing
body: <p>I'm trying to follow this tutorial
  <a href="http://msdn.microsoft.com/en-us/library/vstudio/ee943166.aspx" rel="nofollow">http://msdn.microsoft.com/en-us/library/vstudio/ee943166.aspx</a>
  , but </p>
  
  <pre><code>using Microsoft.VisualStudio.PlatformUI;
  </code></pre>
  
  <p>fails for me. I get an error in VS 2012 and .NET Framework 4.5</p>
  
  <p><strong>The type or namespace name 'VisualStudio' does not exist in the namespace 'Microsoft' (are you missing an assembly reference?)</strong>  </p>
  
  <p>Would be happy if someone tells how to fix it.
  Thanks</p>