Hello,
Thank you for contacting Telerik support.
RichTextEditorRibbonBar uses BackstageView for item start button. More information on this functionality is available here:
http://www.telerik.com/help/winforms/ribbonbar-backstage-view-working-with-backstage-view.html.
Here is also an example how to clear the existing items and add a tab item with a control in it and a button item with some functionality:
Note that changes to the RichTextEditorRibbonBar is recommended to be done with code, not at design time.
I hope that you find this information useful. Should you have any other questions, do not hesitate to contact us.
Regards,
Stefan
Telerik
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