Binding FontFamily / FontSize value for current Control
<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>
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