Two Lines in a StackPanel
<Page xmlns="http://schemas.microsoft.com/winfx/2006/xaml/presentation" xmlns:x="http://schemas.microsoft.com/winfx/2006/xaml" HorizontalAlignment="Stretch" VerticalAlignment="Stretch"> <StackPanel Orientation="Vertical"> <TextBlock Background="Red">A</TextBlock> <Line Stroke="Green" X1="20" Y1="10" X2="100" Y2="40" /> <TextBlock Background="LightGray">B</TextBlock> <Line Stroke="Green" X1="0" Y1="10" X2="100" Y2="0" /> </StackPanel> </Page>