title: Dataform fields won't appear
body: <p>I am trying to learn how to use the Silverlight 3 <b>DataForm</b> control, because I need to define the DataForm fields myself in the XAML code, that is, I don't want to use the AutoGenerateFields property.<br><br>
  My problem is: the dataform works perfectly when the AutoGenerateFields is set to true, but when I create a DataForm and set the fields manually and run the application, all I get is an empty blank rectangle where my form and its fields should be.</p>
  
  <p>I created a blank Silverligh Navigation Application to test this, and below is the code of the Home.xaml page:</p>
  
  <p><code>
  </p>
  
  <pre><code>&lt;Grid x:Name="LayoutRoot"&gt;
  
      &lt;StackPanel&gt;
  
          &lt;!-- This doesn't work. It renders a blank rectangle --&gt;
          &lt;dataFormToolkit:DataForm x:Name="DataForm"&gt;
              &lt;dataFormToolkit:DataForm.EditTemplate&gt;
                  &lt;DataTemplate&gt;
                      &lt;StackPanel dataFormToolkit:DataField.IsFieldGroup="True"&gt;
                          &lt;dataFormToolkit:DataField&gt;
                              &lt;TextBox Text="Test1" /&gt;
                          &lt;/dataFormToolkit:DataField&gt;
                          &lt;dataFormToolkit:DataField&gt;
                              &lt;TextBox Text="Test2" /&gt;
                          &lt;/dataFormToolkit:DataField&gt;
                          &lt;dataFormToolkit:DataField&gt;
                              &lt;TextBox Text="Test3" /&gt;
                          &lt;/dataFormToolkit:DataField&gt;
                      &lt;/StackPanel&gt;
                  &lt;/DataTemplate&gt;
              &lt;/dataFormToolkit:DataForm.EditTemplate&gt;
          &lt;/dataFormToolkit:DataForm&gt;
  
          &lt;!-- This works. --&gt;
          &lt;dataFormToolkit:DataForm x:Name="DataForm2"/&gt;
  
      &lt;/StackPanel&gt;
  
  &lt;/Grid&gt;
  </code></pre>
  
  <p>
  </code></p>
  
  <p>To make the second DataForm work, I simply created a Person class, and put the following in <b>Home.xaml.cs</b>:</p>
  
  <p><pre><code>
  protected override void OnNavigatedTo(NavigationEventArgs e)
  {
      Person client = new Person { Age = 10, DateOfBirth = new DateTime(1980, 10, 20), FirstName = "John", LastName = "Doe" };
      DataForm2.CurrentItem = client;
  }
  </pre></code>
  <br>
  You can see what happens when I run the application:</p>
  
  <p><img src="https://i.stack.imgur.com/dxfr9.png" alt="screenshot"></p>
  
  <p>Does anyone know what's wrong? Thank you in advance.</p>