title: Entity Framework + Team Foundation Server - edmx error
body: <p>When I try to update the existing edmx Model while connected to TFS i receive an error:
  "XmlModels involved in this transasction are not editable".</p>
  
  <p>What's even worse, is that when I try to generate a new model, Visual Studio just crashes out.</p>
  
  <p>It happens only when I'm working online on a project, being connected to team foundation server.</p>
  
  <p>So far the only solution I've found was to edit .edmx file using text editor...</p>
  
  <p>Thanks in advance for any responses.</p>