title: C# WPF COM server E0434352 when rendering 3rd-party controls
body: <p>I am fairly new at C# and WPF.  Here goes.</p>
  
  <p>I created a class library project by converting an existing WPF windows application.  The application works great - I copied the project over, and can still run it as a windows application.  The class library is registered by VS 2010 as a 32-bit COM server.</p>
  
  <p>Consuming the COM server in Builder C++ works a charm.  Most of the functionality in the WPF app works.  However, when I attempt to render a third-party control (<a href="https://wpftoolkit.codeplex.com/" rel="nofollow">Xceed's Extended WPF toolkit</a>) in the main form, I get the above-mentioned exception code ("External exception E0434352").</p>
  
  <p>It is almost certainly an issue with the C# COM server not being able to find/render/reference/whatever the third-party library. </p>
  
  <p>Any ideas?  Please keep in mind that I am not very proficient in .Net yet.</p>
  
  <p>Any help appreciated!</p>