GXT CenterLayout Doesn't work

[ITS_luka]

when I do everything like said here: http://www.sencha.com/examples/pages/layouts/centerlayout.html
I get this.
Untitled.jpg
what to do?

[ITS_luka]

oh.. here is the code:

LayoutContainer lc = new LayoutContainer(); lc.setLayout(new CenterLayout());

ContentPanel panel = new ContentPanel();
panel.setBodyStyle("padding: 6px");
panel.setFrame(true);
panel.setHeading("CenterLayout");
panel.addText("I should be centered");
panel.setWidth(200);

lc.add(panel);

RootPanel.get().add(lc);

[sven]

You have not set a size on your LayoutContainer. This is required.

[ITS_luka]

thank you