title: Cannot add reference to DLL assembly in Silverlight 5 application
body: <p>I'm trying to use the <a href="http://dynamicdatadisplay.codeplex.com/" rel="nofollow">Dynamic Data Display</a> (D3) library for displaying graphs in a Silverlight 5 application (out-of-browser). Whenever I try to add "DynamicDataDisplay.dll" as reference, it gets removed again after I close the dialog.</p>
  
  <p>I can however use the reference in a normal Windows Forms or WPF project. So is this some restriction with the Silverlight framework?</p>
  
  <p>What can I do about this? Maybe compile D3 myself in a different way?</p>