Using common TextElement attached properties
<Window xmlns="http://schemas.microsoft.com/winfx/2006/xaml/presentation" xmlns:x="http://schemas.microsoft.com/winfx/2006/xaml" HorizontalAlignment="Center" VerticalAlignment="Center" Width="160"> <Button TextElement.FontFamily="Parchment" TextElement.FontSize="80"> Cancel </Button> </Window>