Thank you Mauro, this did the trick - except the templateUrl can now simply be './open.component.html' as I expected it in the first place. There is a answer on Stack Overflow with a little background information:
http://stackoverflow.com/questions/37178192/angular2-what-is-the-meanings-of-module-id-in-component#37178813 -- You received this message because you are subscribed to the Google Groups "Angular" group. To unsubscribe from this group and stop receiving emails from it, send an email to [email protected]. To post to this group, send email to [email protected]. Visit this group at https://groups.google.com/group/angular. For more options, visit https://groups.google.com/d/optout.
