private void createLabel(Component container, String key, String value) {
Hbox box = new Hbox();
box.setParent(container);
new Label(key + ": ").setParent(box);
Label label = new Label(value != null ? value : "NULL");
label.setClass(key);
label.setParent(box);
}
public void showMessage(String msg, String sclass) {
label.setValue(msg);
label.setClass(sclass);
label.setVisible(true);
}