WPF RichTextBox: How to change selected text font?

Question

how can I change the font for a currently selected text area inside a WPF RichTextBox?

Answer 1

How about something like:

 TextSelection text = richTextBox.Selection; 
 if (!text.IsEmpty) 
 { 
     text.ApplyPropertyValue(RichTextBox.FontSizeProperty, value); 
 }