/*
* Create the browser using the model. We use <code>null</code> as the
* default value of the root node. The default value will be passed to
* CustomTreeModel#getNodeInfo();
*/
CellBrowser browser = new CellBrowser(model, null);
browser.setKeyboardSelectionPolicy(KeyboardSelectionPolicy.ENABLED);
// Add the browser to the root layout panel.
RootLayoutPanel.get().add(browser);
}