RadRichTextBox does not support syntax highlighting. This feature is not scheduled for Q1 2011 and even though we have discussed the possible use of RadRichTextBox as a code editor, a road map has not been set yet.
If you need to only present code with syntax highlighting, you can do this in a way similar to the following demo:
You can, however, search and highlight words on demand, as shown in the demo in this forum thread.
If you have any other questions, do not hesitate to contact us again.
All the best,
the Telerik team
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