how to add something (anything?) to a ScrollPane (using java code)

[Schwartz, Cynthia L]

How come this shows the scrollbars and puts nothing in the scrollPane?   I 
tried images instead of a label, also tried a simple border, ....

public void startup(Display display, Map<String, String> properties) {
        Window window = new Window();
        ScrollPane scrollPane = new 
ScrollPane(ScrollPane.ScrollBarPolicy.ALWAYS,ScrollPane.ScrollBarPolicy.ALWAYS);
        scrollPane.add(new Label("test"));
        window.setContent(scrollPane);
        window.setMaximized(true);
        window.open(display);
    }

Thanks,
Cynthia