Need a HTML Editor in Windows Application

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C#

C#4.0

I need a HTML Editor in windows application that should function the same as in outlok like should have the features of indent,outdent,bold,italics, change of font color, insert links as well as images,

I have gone through an editor and made few changes in the app for the application on the given link but the email body gets disabled on use at multiple places given is my UserControl

Link foR controls in which changes were made

http://www.codeproject.com/Articles/15559/A-Windows-Forms-based-text-editor-with-HTML-output