FYI, if others are having problems with the AutomationId's not working for the RibbonView component, here's what we submitted in another support ticket that might be helpful if you are experiencing this same problem.
We have setup a test RibbonView WPF project using the 2014.2.721.40 version of the Telerik RibbonView (and other, e.g. Navigation, Input, etc.) components. When we look at the application with the Microsoft Inspect tool we only see the top-level ribbon tabs populated with automation trees. This is a problem for our automation testing since we need to be able to drive the user interface by using the automation tags (AutomationIds specifically) to control the user interface.
We were able to recompile this test RibbonView project using an older version of the Telerik components, specifically version 2014.1.0224.45, and this would correctly populate the automation tree.