CSS Syntax Highlighting in RichTextBox or Another Tools

Question

Hi guys

can you give me a code to use the CSS Syntax Highlighting in the RichTextBox. I have searched a lot but I have not found but i found a Fastcolortextbox tool and the ICSharpCode.TextEditor tool but it does not contain CSS. Is there a way to add CSS into one of these tools or is there another tool that contains CSS.