I am not quite able to understand your case.
The code form Alex's snippet shows how you can create a new blank document that has the same properties that RadRichTextBox sets on its default document. After you create this document, you can set it to the Document property of RadRichTextBox in the following way:
.radRichTextBox1.Document = CreateDocument();
Saving the document using the format providers is an entirely new story. If you wish to save the document, without showing it in a rich text box, you need to measure and arrange the document in advance. Please refer to the code-snippet below:
RadDocument document =
//Set some properties, add Blocks (Paragraphs and Tables), etc.
If this does not answer your question, we would really appreciate some more detailed information on your scenario.
the Telerik team
Do you want to have your say when we set our development plans?
Do you want to know when a feature you care about is added or when a bug fixed?
Telerik Public Issue Tracking
system and vote to affect the priority of the items