org.eclipse.xwt.tests/src/org/eclipse/xwt/tests/forms/Form_Background.xwt

<Shell xmlns="http://www.eclipse.org/xwt/presentation"
       xmlns:x="http://www.eclipse.org/xwt">
    <Shell.layout>
        <FillLayout/>
    </Shell.layout>
    <Form name="FormBackground" text="New Form" background="COLOR_YELLOW"/>
    <Form name="Form" text="New Form"/>
</Shell>