title: Combobox doesn't show the new entries
body: <p>Hi<br>
  I've problem in using entity framework + binding source + combobox .<br>
  I'm binding an entity to the binding source which is the data source of the combobox control, the problem appears when i add new item to the context like this :  </p>
  
  <pre><code>myEntity ent =new myEntity() { entName="aaaa" };
  
  ctx.AddObject('myEntitySetName',myEntity);
  
  ctx.SaveChanges();  
  </code></pre>
  
  <p>The combobox doesn't show the new entry...how can i refresh the data source of this control ?<br>
  I tried this :</p>
  
  <pre><code>myComboBox.DataSource = myBindingSource.DataSource;  
  </code></pre>
  
  <p>It works fine for the first add operation and show the new entry but when i add second and third ...etc .. nothing happend .. the data is saved to the database correctly but it never listed in the combobox ...  </p>
  
  <p>Any help ?</p>