horizontalLine = new Panel();
horizontalLine.widthProperty().set(5);
horizontalLine.heightProperty().set(1);
horizontalLine.translateXProperty().set(2);
horizontalLine.translateYProperty().set(4);
horizontalLine.backgroundProperty().set(new ColorBackground(Color.GRAY));
horizontalLine.handlePointerProperty().set(false);
this.getChildren().add(horizontalLine);
verticalLine = new Panel();
verticalLine.widthProperty().set(1);
verticalLine.heightProperty().set(5);
verticalLine.translateXProperty().set(4);
verticalLine.translateYProperty().set(2);
verticalLine.backgroundProperty().set(new ColorBackground(Color.GRAY));
verticalLine.handlePointerProperty().set(false);
this.getChildren().add(verticalLine);
expandedProperty().addChangeListener(new IChangeListener() {