@Tag("jakis-tag")
publi class JakasKlasa {
    @Autowired
    private JakisComponent jakisComponent;

    (...)

    jakisButton.addClickListener(e -> {
        UI ui = UI.getCurrent();
        ui.access(() -> {
            jakisComponent.add(new Span("DUPSON"));
            ui.push();
        })
    }
}