Just wanted to remind you of the subject, because of a recent conversation with a customer about the new DevExpress XtraDashboard product:
http://www.devexpress.com/issue=Q449507

I suggest you take another look at the How to show custom forms and controls in XAF (Example) that shows how to implement it yourself.
Of course, XAF provides a ton of other extensibility points and customization approaches. It is easy to use them once you understand the XAF UI construction principles.