Welcome to the punch-it wiki!

Some tutorial for WPF Stuff:

Communication between Classes with Messages (MVVM Light) https://social.technet.microsoft.com/wiki/contents/articles/26070.communicating-between-classes.aspx

Handling events and Commands in an MVVM WPF application https://blog.magnusmontin.net/2013/06/30/handling-events-in-an-mvvm-wpf-application/