title: setExtent causes ScrollView not found error in BlackBerry 9000
body: <p>This--</p>
  
  <pre><code>import net.rim.device.api.ui.container.VerticalFieldManager;
  
  public class FixedHeightVerticalFieldManager extends VerticalFieldManager 
  {
    private int height;
  
    public FixedHeightVerticalFieldManager(int height)
    {
      super();
      this.height = height;
    }
  
    protected void sublayout(int maxWidth, int maxHeight)
    {
      super.sublayout(maxWidth, height);
      setExtent(height);
    }
  }
  </code></pre>
  
  <p>--causes the emulator to hang with the runtime exception <code>net.rim.device.api.ui.ScrollView not found</code>.  It seems to be caused by the call to <code>setExtent</code>, which is a method <code>VerticalFieldManager</code> inherited from <code>Field</code>, which is in the 4.6 API that the emulator is set up to use.  Why?  What does ScrollView have to do with anything?</p>