import com.vaadin.flow.component.button.Button; import com.vaadin.flow.component.button.Button.ClickEvent; import com.vaadin.flow.component.html.Label; import com.vaadin.flow.component.orderedlayout.VerticalLayout; import com.vaadin.flow.router.Route; @Route("") public class ButtonDemoView extends VerticalLayout { public ButtonDemoView() { button.addClickListener(this::buttonClickHandler); add(button); } private void buttonClickHandler(ClickEvent<Button> event) { add(label); } }