Person person = new Person();
PersonEditor editor = new PersonEditor();
PersonDriver driver = GWT.create(PersonDriver.class);
driver.initialize(editor);
// Start editing
driver.edit(person);
// Act : edit widget
Browser.fillText(editor.firstName, "John");
Browser.fillText(editor.lastName, "Locke");
Browser.fillText(editor.address.street(), "Avenue des Champs Elysées");