<StackPanel xmlns="http://schemas.microsoft.com/winfx/2006/xaml/presentation" xmlns:x="http://schemas.microsoft.com/winfx/2006/xaml" TextBlock.FontSize="12" > <StackPanel Orientation="Horizontal" HorizontalAlignment="Center"> <TextBlock Text="This TextBlock has a FontFamily of " /> <TextBlock Text="{Binding RelativeSource={RelativeSource self},Path=FontFamily}" /> <TextBlock Text=" and a FontSize of " /> <TextBlock Text="{Binding RelativeSource={RelativeSource self},Path=FontSize}" /> </StackPanel> </StackPanel>