Hi Henry ,
Thanks for your interests in syncfusion products.
You can achieve your requirement by simply dragging the SplitButton over the RibbonControlAdv and close the Help Button.
Please have the sample from the below link and let us know if you have any queries.
[sample link]
http://www.syncfusion.com/downloads/Support/DirectTrac/103894/WindowsFormsApplication771292250762.zip
Please let us know if you have any concerns.
Regards,
Paul Anderson S