Run elements, each with its own font size, color, and typeface
<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'>
<TextBlock TextWrapping="Wrap"
HorizontalAlignment="Center"
TextAlignment="Right">
<Run FontFamily="Comic Sans MS"
FontSize="20" FontWeight="Bold"
Foreground="DarkBlue"
Text="I think, therefore I am."/>
<LineBreak />
<Run FontFamily="Ariel"
FontSize="10" FontStyle="Italic"
Foreground="LightBlue"
Text="-Rene Descartes"/>
</TextBlock>
</UserControl>
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