org.eclipse.xwt.tests/src/org/eclipse/xwt/tests/style/css/HelloWorld.xwt

 <Composite xmlns="http://www.eclipse.org/xwt/presentation">
<!--  	<Composite.Resources>
     <CSSStyle x:Key="style" url="/test/style.css"/>
    </Composite.Resources> -->
	<Composite.layout>
		<GridLayout numColumns="2" />
	</Composite.layout>
	<Text text="bla bla bla   "/>
	<Text text="bla bla bla   " />
</Composite>