title: AjaxControlToolkit reference in VS2010 with .NET 2.0
body: <p>I have a strange problem when attempting to compile an old website which is hamstrung with .NET 2.0 and VS2010.</p>
  
  <p>I've installed ASP.NET AJAX 1.0 and I have the AjaxControlToolkit binary referenced in the project, both resolve just fine and appear in the Object Browser. Code highlighter also shows their presence is detected.</p>
  
  <p>However, when I try to compile, AjaxControlToolkit disappears from the Object Browser and I get a whole bunch of "'AjaxControlToolkit' is not declared" errors. I have to reload the solution in VS for it to reappear in the Object Browser.</p>
  
  <p>The AjaxControlToolkit reference has the following attributes:</p>
  
  <pre><code>Description: Ajax Control Toolkit
  Identity: AjaxControlToolkit
  Resolved: True
  Runtime Version: v2.0.50727
  Specific Version: False
  Strong Name: True
  Version: 1.0.11119.25055
  </code></pre>
  
  <p>Any ideas?</p>