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)

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);

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