How to make CustomerLayout html

Hi,

How to make a CustomLayout with Vaadin?

I have created a HTML page, but when i try use it i receive a message that my layout is not found.

My class:


@SuppressWarnings("serial")
public class MainLayout extends VerticalLayout {
	
	public MainLayout() {
		setMargin(false);
		setSpacing(false);
		
        CustomLayout custom = new CustomLayout("MainLayout");
        addComponent(custom);
	}

}

Where i have to put my html page?

See
http://vaadin.com/book/-/page/layout.customlayout.html
.