private TextInputControl createPasswordbox(
     de.akubix.keyminder.core.ApplicationInstance instance, boolean init) {
   PasswordField t = new PasswordField();
   if (!init) {
     t.setText(getUIValue());
   }
   t.addEventFilter(
       KeyEvent.KEY_RELEASED,
       new EventHandler<KeyEvent>() {
         @Override
         public void handle(KeyEvent event) {
           storeData(instance.getTree().getSelectedNode());
         }
       });
   return t;
 }