Widget formPanel = renderer.render(form);
formPanel.setWidth("300px");
SimpleButton validateButton = new SimpleButton("Validate", new ClickHandler() {
public void onClick(ClickEvent event) {
form.submit(new SubmitHandler.Adapter() {
public void success(Record record) {
StringBuilder sb = new StringBuilder();
for (Map.Entry<String, Object> entry : record.getAllValues().entrySet()) {
sb.append(entry.getKey()).append(" = ").append(entry.getValue()).append("\n");
}