Thank you for contacting us. Let us get straight to the issues at hand:
1. You are not able to see RadRichTextBox in the Visual Style Builder because the control requires .NET framework 4.0. Currently, the VSB tool is built for a previous version of the framework (2.0). We plan to make a 4.0 build by the next official release, however, there is not a scheduled date yet.
2. Unfortunately, RadRichTextBox does not support adding content at design time. Even though our documentation mentions design-time support, RadRichTextBox for WinForms
does not allow predefined content. Our team would like to thank you for pointing out this discrepancy. I have updated your Telerik points for your report.
To set the document content use the approaches illustrated under the RichTextBox >> Feature >> Document Elements
section in our documentation.
the Telerik team
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