I have just posted a small sample project to the suggestion discussed in the http://www.devexpress.com/issue=S19008 ticket:

"I want to close this ticket with a solution that was successfully used by many of our users through these years.
You can write a platform-agnostic code for displaying a confirmation dialog by using PopupWindowShowAction that will display a DetailView of a non-persistent object or even a DashboardView with a text, image, etc.

It is easy to implement and, taking into account ASPxPopupControl integration in 12.1, this looks like a good solution that fully meets the original requirement. Attached is a small sample project + a screenshow showing how it looks in Win and Web UI."