<TextBlock FontSize="36"

TextWrapping="Wrap">

This is

some <Run FontWeight="Bold">bold</Run> text and

some <Run FontStyle="Italic">italic</Run> text and

some <Run Foreground="Red">red</Run> text and

some <Run TextDecorations="Underline">underlined</Run> text

and some <Run FontWeight="Bold"

FontStyle="Italic"

Foreground="Cyan"

FontSize="72"

TextDecorations="Underline">big</Run> text. </TextBlock>