As I explained in my previous post, hyperlinks in the context of RadRichTextBox are closer to the ones in document processors rather than the Silverlight runtime. Still, if you want to you can add an actual HyperlinkButton in a document which should allow you to achieve the desired result. Please check this article
explaining InlineUIContainers. Note that the export of these document elements is limited, so if you want to preserve your documents you would need to use XAML format.
I hope this is helpful.
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