Layout in J2ME, MIDP 2.0

Hi,
I wrote a little Midlet and want to have a StringItem and a TextField
next to each other, i.e. they should be in the same row. After
considering MID Profile I coded my Midlet as listed below.

So in my understanding they should be in the same row. The only
condition, which I cannot be sure of is "this Item has a LAYOUT_LEFT,
LAYOUT_CENTER, or LAYOUT_RIGHT directive that differs from the Form's
current alignment." (MIDP, class Form).

But how can I set the directive of a Form? Or did I misunderstand sth?
Why are the two items not in ONE row?

Thanks in advance!
Best regards, Franz

---BEGIN CODE---
public class Layout extends MIDlet implements CommandListener {
    private Display display;
    private Form form;
    private Command EXIT;

    public Layout() {
        display = Display.getDisplay(this);
    }

    public void startApp() {
        form = new Form("LayoutTest");
        EXIT = new Command("Exit", Command.SCREEN, 1);

        StringItem s1 = new StringItem("", "Eingabe:");
        TextField tf1 = new TextField("", "", 20, TextField.ANY);
        tf1.setLayout(TextField.LAYOUT_2);

        form.append(s1);
        form.append(tf1);
        form.addCommand(EXIT);
        form.setCommandListener(this);

        display.setCurrent(form);
    }
    public void pauseApp() {
    }
    public void destroyApp(boolean unconditional) {
    }
    public void commandAction(Command command, Displayable
displayable) {
        if(command == EXIT) {
            destroyApp(false);
            notifyDestroyed();
        }
    }
}
---END CODE---