I am not sure how Lan's implementation is performed, however, the only solution I can offeris to set an image to the content panel, and right align this image. In this case it will always be positioned on the right side, but the ribbon groups will overlap it if they reach to it:
radRibbonBar1.RibbonBarElement.TabStripElement.ContentArea.Image = Resources.folder_open;
radRibbonBar1.RibbonBarElement.TabStripElement.ContentArea.ImageAlignment = ContentAlignment.MiddleRight;
I hope that this will work for you.
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