<GroupTemplate Id="Ribbon.Templates.Flexible2">
        <Layout Title="LargeLarge">
          <OverflowSection Type="OneRow" TemplateAlias="o1" DisplayMode="Large"/>
          <OverflowSection Type="OneRow" TemplateAlias="o2" DisplayMode="Large"/>
        </Layout>
        <Layout Title="LargeMedium">
          <OverflowSection Type="OneRow" TemplateAlias="o1" DisplayMode="Large"/>
          <OverflowSection Type="ThreeRow" TemplateAlias="o2" DisplayMode="Medium"/>
        </Layout>
        .....