Richard Moss (http://cyotek.com/) has written a very good article about how to add CSS syntax highlighting to the DigitalRune Text Editor Control.
Check it out: CSS Syntax Highlighting in the DigitalRune Text Editor Control (by cyotek.com)
A collection of the most useful blog articles can be found here:
Article Collection (on Documentation page)
DigitalRune is a trademark of Garstenauer Information Technology OG.
Garstenauer Information Technology OG Weingartenstrasse 35, 4452 Ternberg Austria (EUROPE) office@digitalrune.com