ModalDialogs, IEditableObject and MVVM in Silverlight 4

P.Popadiyn had a big Silverlight project, performing a great number of CRUD operations. He needed to find a unified way of showing Modal Dialogs in a MVVM manner, without using any code in the View. The logic of showing dialogs must reside in the ViewModel, not in the code-behind. Find out the solution in this article.