nameField.addListener(changeListener);
nameField.setImmediate(true);
nameField.setWidth("100%");
final PasswordField passwordField = new PasswordField("Password", "");
passwordField.addListener(changeListener);
passwordField.setImmediate(true);
passwordField.setWidth("100%");
Button loginButton = new Button("Login");
loginButton.setImmediate(true);