Scrollbar's Layout on Panel

Hello, i am newbie on vaadin and I met some difficulties… I am trying to add scrollbar on my Layout which are on a Panel.
I have 1 panel, 1 horizontal split and 2 Layout which each contains, 2 tables. (excuse me for my language :p)

[code]
pan = new Panel();

    testPanel = new HorizontalSplitPanel();
    testPanel.setWidth(100, Unit.PERCENTAGE);
    testPanel.setSplitPosition(50, Unit.PERCENTAGE);

    h1 = new VerticalLayout();
    h1.setSizeFull();


    h2 = new VerticalLayout();    
    h2.setSizeFull();


    tableDose = new Table();
    tableDose.setWidth(600, Unit.PIXELS);
    tableDose.setSelectable(true);
    tableDose.setImmediate(true);
    tableDose.setCaption("Liste : ");
    tableDose.addContainerProperty("Nom de l'accident type", String.class, null);
    tableDose.addContainerProperty("Point de rejet", String.class, null);
    tableDose.addContainerProperty("Rejet", String.class, null);
    tableDose.addContainerProperty("Défaut", String.class, null);
    tableDose.setPageLength(4);

    table1 = new Table();
    table1.setSelectable(true);
    table1.setImmediate(true);
    table1.setCaption("Liste : ");
    table1.addContainerProperty("Nom de l'accident type", String.class, null);
    table1.addContainerProperty("Point de rejet", String.class, null);
    table1.addContainerProperty("Rejet", String.class, null);
    table1.addContainerProperty("Défaut", String.class, null);
    table1.setPageLength(6);

    b1 = new Button();
    b2 = new Button();

    this.setSizeFull();
    this.addComponent(pan);

    pan.setContent(testPanel);

    testPanel.setFirstComponent(l1);
    testPanel.setSecondComponent(l2);

    h1.addComponents(tableDose, b1);
    h2.addComponents(table1, b2);

[/code]With this code, when I move my horizontal split on the left or right, I don’t have scrollbar on my layout, so I can’t see all my tables… How can I do ?

examples on pictures :
http://www.hostingpics.net/viewer.php?id=381893401.jpg
http://www.hostingpics.net/viewer.php?id=432976242.jpg