You are right, the method I suggested refers to PrintMode.HtmlPreview, which is obsolete. Thank you for pointing this out.
What we have had in mind is that the method of RadRichTextBox PrintPreview() should be used. However, as this method does not accept a document name as a parameter, we will revise our plans and will make sure to provide a way to set the document name in the preview before removing the property.
All the best,
the Telerik team
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