[Layout] Stage must be resized to force layout

1) run TestAlignment
2) BUG: the window comes up empty
3) resize the window and it will draw / layout


/*
 * Copyright (c) 2014, Oracle and/or its affiliates. All rights reserved.
 * DO NOT ALTER OR REMOVE COPYRIGHT NOTICES OR THIS FILE HEADER.
 */


import javafx.application.Application;
import javafx.geometry.Pos;
import javafx.scene.Scene;
import javafx.scene.control.Accordion;
import javafx.scene.control.Label;
import javafx.scene.control.TitledPane;
import javafx.stage.Stage;

/**
 *
 * @author Pavel Kouznetsov (pavel.kouznetsov@oracle.com)
 */
public class TestAlignment extends Application{

    @Override
    public void start(Stage stage) throws Exception {
        int panes_num = 5;

        Accordion accordion = new Accordion();
        for (int i = 0; i < panes_num; i++) {
            Label label = new Label("Pane " + i + " Conten1t");
            label.setAlignment(Pos.TOP_LEFT);

            TitledPane pane = new TitledPane("Pane " + i, label);
            System.out.println(i + " : align = " + pane.getAlignment().name());
            accordion.getPanes().add(pane);
        }
        accordion.setExpandedPane(accordion.getPanes().get(3));
        System.out.println("expanded align = " + accordion.getPanes().get(3).getAlignment().name());

        stage.setScene(new Scene(accordion, 400, 400));
        stage.show();
    }

    public static void main(String[] args) {
        launch(args);
    }

}