Yes, the article you mentioned is not up to date with the new skins of RadPanelBar. We are planning to update it, meanwhile you can use the Telerik Visual Style Builder
to modify an existing skin according to your needs.
the Telerik team
Do you want to have your say when we set our development plans?
Do you want to know when a feature you care about is added or when a bug fixed?
Telerik Public Issue Tracking
system and vote to affect the priority of the items