title: Trying to get GWT DataGrid to work in UiBinder
body: <p>I am trying to get the hang of UI Binder in GWT.</p>
  
  <p>So far, I have a basic application to display a DataGrid with some sample data, and it can be easily switched between traditional GWT and UIBinder. It works correctly in traditional GWT but not in UiBinder.</p>
  
  <p>Here's the main EntryPoint class:</p>
  
  <pre><code>public class Main implements EntryPoint {
  
    public void onModuleLoad() {
  
          uiBinder(); //call either uiBinder() or gwt() here
    }
  
    /* Use UiBinder to display grid */
    public void uiBinder() {
          HelloWorld hello = new HelloWorld();
          RootPanel.get("myid").add(hello);
    }
  
    /* Use traditional GWT to display grid */
    public void gwt() {
          DataGrid&lt;Contact&gt; grid = new DataGrid&lt;Contact&gt;();
          GridInitializer.init(grid);
          RootLayoutPanel.get().add(grid);
    }
  
  }
  </code></pre>
  
  <p>Here's the HelloWorld.java used by UiBinder:</p>
  
  <pre><code>public class HelloWorld extends Composite {
  
    interface MyUiBinder extends UiBinder&lt;Widget, HelloWorld&gt; {}
    private static MyUiBinder uiBinder = GWT.create(MyUiBinder.class);
  
    @UiField DataGrid&lt;Contact&gt; grid;
  
    public HelloWorld() {            
          GridInitializer.init(grid);
          initWidget(uiBinder.createAndBindUi(this));
    }
  }
  </code></pre>
  
  <p>The GridInitializer class sets up grid columns and sample data. I there's nothing wrong there because it renders correctly if I use traditional GWT.</p>
  
  <p>Here is HelloWorld.ui.xml:</p>
  
  <pre><code>&lt;!DOCTYPE ui:UiBinder SYSTEM "http://dl.google.com/gwt/DTD/xhtml.ent"&gt;
  &lt;ui:UiBinder xmlns:ui='urn:ui:com.google.gwt.uibinder'
    xmlns:g='urn:import:com.google.gwt.user.client.ui'
    xmlns:c="urn:import:com.google.gwt.user.cellview.client"&gt;
  
    &lt;g:DockLayoutPanel unit="EM"&gt;
      &lt;g:center&gt;
        &lt;c:DataGrid ui:field='grid' /&gt;
      &lt;/g:center&gt;
    &lt;/g:DockLayoutPanel&gt;
  
  &lt;/ui:UiBinder&gt;
  </code></pre>
  
  <p>If I use UI Binder, nothing displays at all. I'm at a loss. Any suggestions?</p>