Add a breakline in tooltip

¿How can I add a breakline to a text inside a tooltip in XAML?

I try with this:

        <Label Name="label4" UseLayoutRounding="False" Focusable="False" AllowDrop="False" Foreground="Black" Margin="6,44,132.027,76" ToolTipService.ShowDuration="12000">
                <Label.ToolTip>
                    <ToolTip>
                    <TextBlock>Lorem ipsum dolor sit amet, consectetur adipiscing elit. </TextBlock>
                    <TextBlock>Suspendisse eget urna eget elit ullamcorper tincidunt. Sed nec arcu sed ante sodales </TextBlock>
                    <TextBlock>Pellentesque elit libero, semper ac tincidunt vitae, euismod at ligula.</TextBlock>
                    </ToolTip>
                </Label.ToolTip>
            <Label.Content>
                <TextBlock TextAlignment="Right" TextWrapping="Wrap" Height="19" Width="108" >Lorem Ipsum</TextBlock>
            </Label.Content>
        </Label>

But doesn't works: