title: Visual Studio designer in x64 doesn't work
body: <p>In Visual Studio 2010 64bit I can't design my forms.<br>
  I keep getting this warning (and error):</p>
  
  <pre><code>Warning 18  
  The designer could not be shown for this file because none of the classes within it can be designed.  The designer inspected the following classes in the file: 
  MainForm --- The base class 'Blah' could not be loaded.  Ensure the assembly has been referenced and that all projects have been built.
  </code></pre>
  
  <p>This only happens with when I compile for x64 ... in x86 the designer works well.</p>
  
  <p>Just want to be clear that I NEED the project to work on x64 because a lot of the project's components are compiled in x64 and won't work if the forms are in x86.</p>
  
  <p>Has anyone else encountered this and found a solution ?</p>