Hello,
since it is named "Hello World", there should also be a label placed onto the second window with "Hello World" in it.
Just saying... I understand that this is an introductory tutorial, but never is "Hello World!" actually to be read anywhere... :-)
Also, some more elaborate sample projects would be nice, so that one could see how to set up things and apply best practices... I will add that to the Feature request discussion as well.