Nested StackPanels
<UserControl x:Class='SilverlightApplication3.MainPage' xmlns='http://schemas.microsoft.com/winfx/2006/xaml/presentation' xmlns:x='http://schemas.microsoft.com/winfx/2006/xaml' xmlns:d='http://schemas.microsoft.com/expression/blend/2008' xmlns:mc='http://schemas.openxmlformats.org/markup-compatibility/2006' mc:Ignorable='d' d:DesignWidth='640' d:DesignHeight='480'> <StackPanel Orientation="Vertical" Background="White"> <StackPanel Orientation="Horizontal" Background="LightGray" Margin="10"> <TextBlock Text="Horizontal StackPanel - First Control" FontSize="20" Foreground="Navy" Margin="10" /> <TextBlock Text="Horizontal StackPanel - Second Control" FontSize="20" Foreground="Red" Margin="10" /> </StackPanel> </StackPanel> </UserControl>