Prism PopupChildWindowAction in Desktop DLL missing

Question

I am trying to implement modal dialog in the WPF Prism Desktop application.

From Prism guidance I can see that proper way should be using Interaction:

Answer 1

Here is an example made in WPF:
http://blogs.southworks.net/dcherubini/2012/05/24/popupwindowaction-using-custom-views-instead-of-windows-in-wpf-and-prism/