title: Using AttachTo with a Contained EntitySet
body: <p>I have some classes defined as below:</p>
  
  <pre><code>public class Table
  {
  
      [Key]
      public string Name { get; set; }
  
      [Contained]
      public IList&lt;TableEntity&gt; Entities { get; set; }
  }
  
  public class TableEntity
  {
      [Key]
      public string Partition { get; set; }
  }
  </code></pre>
  
  <p>I want to use AttachTo to add an object to the DataServiceContext without querying for it first. How can I do this? </p>