title: NHibernate throwing "Unable to resolve property:", but property doesn't exist *ANYWHERE* in project
body: <p>I'm getting a weird issue with nHibernate... I'm getting this exception:</p>
  
  <pre><code>Unable to resolve property: _Portal
  </code></pre>
  
  <p>when I try to commit an object graph.  The strange thing is that when I search through the entire solution, I don't seem to have this particular property <em>ANYWHERE</em> within the project?!</p>
  
  <p>Has anyone run into this particular case, and if so, what did they do to resolve?</p>