public DateDialog(Component parentComponent, String title) {
        super();
        Caption dialogCaption = new Caption(title);
        setWidth("600px");
        setHeight("400px");
        setSclass("dialog");
        setSizable(false);
        setClosable(false);
        setStyle("padding: 10px 10px;");
        setParent(parentComponent);

        Label dateLabel = new Label("Input date");
        dateLabel.setHflex("1");
        dateBox = new Datebox();
        dateBox.setFormat("dd.MM.yyyy");
        dateBox.setLenient(false);
        dateBox.setHflex("1");
        dateBox.addEventListener(Events.ON_CHANGE, (SerializableEventListener<Event>) event -> {
            String errorMessage = dateBox.getErrorMessage();
            if (errorMessage != null && !errorMessage.trim().isEmpty()) {
                Messagebox.show("Incorrect date:\n" + errorMessage, "Error", Messagebox.OK, Messagebox.ERROR);
            }
        });

        Hlayout dateLayout = new Hlayout();
        dateLayout.appendChild(dateLabel);
        dateLayout.appendChild(dateBox);

        clientLayout = new Vlayout();
        clientLayout.appendChild(dateLayout);

        mainLayout = new Vlayout();
        appendChild(dialogCaption);
        appendChild(mainLayout);
        mainLayout.appendChild(getVSplitter());
        mainLayout.appendChild(clientLayout);
        mainLayout.appendChild(getVSplitter());
        initButtons();
    }

setLenient(false)