[ACCORDION] Unexpanded stays at old position, when position is changed in expandedproperty changelistener

IF on an accordion an changelistener is added to the expandedpane property and in his changelistener the layoutX and layoutY Position of the accordion is changed, the unexpanded accordion stays at its old place. If the unexpanded accordion is clicked on again, an other expanded accordion appears and the unexpanded accordion disappears. To unexpand, you have to unexpand both accordions, although there is only one accorion in the java-code.

hbox.getChildren().addAll(pc, bc);
final Accordion ac = new Accordion();

final TitledPane tp = new TitledPane();
tp.setText(cantonTeacherData.getCantonAbbreviation());
tp.setContent(hbox);
tp.setCollapsible(true);
ac.getPanes().add(tp);

hbox.getChildren().remove(0);
hbox.getChildren().remove(0);

ac.setLayoutX(point.getX());
ac.setLayoutY(point.getY());

ac.expandedPaneProperty().addListener(new ChangeListener<TitledPane>() {

      @Override
      public void changed(ObservableValue<? extends TitledPane> observable, TitledPane oldValue, TitledPane newValue) {
        if (newValue != null) {
//adds the elements, so that width of the accordion is fully expanded
          hbox.getChildren().addAll(pc, bc);
          ac.setLayoutX(0);
          ac.setLayoutY(0);
          ac.toFront();
        } else {
//makes the unexpanded accordions width only the width of the title
          hbox.getChildren().remove(0);
          hbox.getChildren().remove(0);

          ac.setLayoutX(point.getX());
          ac.setLayoutY(point.getY());

        }
      }

    });