RootLayoutPanel versus RootPanel with ScrollPanel

I've been having a problem getting ScrollPanel to work as expected (or as I expect) in my app.  So, I've reduced the problem to a simple case.

The code below is from the example of a Custom Data Provider that Google provides in the CellWidgets Developer Guide:

https://developers.google.com/web-toolkit/doc/latest/DevGuideUiCellWidgets  (scroll down to Custom Data Source to see the code).

Question is, why doesn't this work when RootPanel is replaced with RootLayoutPanel?  No scroll bars appear at all, and that is what I'm experiencing in my app.

Mike

public class RangeChangeHandlerExample implements EntryPoint {

  @Override
  public void onModuleLoad() {
    // Create a CellList.
    final CellList cellList = new CellList(new TextCell());

    // Add a range change handler.
    cellList.addRangeChangeHandler(new RangeChangeEvent.Handler() {
      @Override
      public void onRangeChange(RangeChangeEvent event) {
        Range range = event.getNewRange();
        int start = range.getStart();
        int length = range.getLength();

        // Create the data to push into the view. At this point, you could send
        // an asynchronous RPC request to a server.
        List data = new ArrayList();
        for (int i = start; i < start + length; i++) {
          data.add("Item " + i);
        }

        // Push the data into the list.
        cellList.setRowData(start, data);
      }
    });

    // Force the cellList to fire an initial range change event.
    cellList.setVisibleRangeAndClearData(new Range(0, 25), true);

    // Create paging controls.
    SimplePager pager = new SimplePager();
    pager.setDisplay(cellList);

    // Add the widgets to the root panel.
    VerticalPanel vPanel = new VerticalPanel();
    vPanel.add(pager);
    vPanel.add(cellList);
    RootPanel.get().add(vPanel);
  }
}

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