bugfix: forgot to read the currentAccountInfo before using it

add class to make te project compile

test in order to succeed setup

Chapter13: add exercise and elaborate ex8

ChapterExamens: bump guts nuget version

update to latest guts version

update to latest guts version

update tests for chapter10

update chapter8

Chapter 5, 6, 7: updates

bugix merge

Bugfix ex6.8: check for content, not name in labels.

Bugfix ex6.8: check for content, not name in labels.

Exercise 8.7: use TextBox instead of TextBlock to show results

Ex 7.14 Bugfix: find radiobuttons via grid of its parent groupbox