C# – Sharepoint 2010 – Custom Ribbon

i'm developing a sharepoint project and central admin pages (located in _layouts), and i want to use Ribbon bar.
i have found this sample but i hope so, it is wrong..

http://sharepointsolutions.com/sharepoint-help/blog/index.php/2009/10/creating-a-custom-ribbon-tab-in-sharepoint-2010/

page throw this error:
Ribbon node must have a subnode.

Element.xml have a and subnode, i don't found any error this file..

How can i add Ribbon to the custom page?
Do you have a suggestion?

Thanks,