title: Entity Framework 5 update model from database does not generate table class
body: <p>I am using EF5 in VS2012, database first method.</p>
  
  <p>When I add a new table X to the design surface, the table shows, then I save and compile without error. However, no class X is ever generated (under MyModel.tt in solution explorer).</p>
  
  <p>If I right click MyModel.tt and choose "Run Custom Tool", then the classes are generated. </p>
  
  <p>This behavior is different than what I experienced in EF4 and VS 2010, where the classes are automatically generated.</p>
  
  <ol>
  <li>Can I change this behavior so that the table classes are automatically generated?</li>
  <li>Why aren't the classes for tables generating automatically?</li>
  </ol>