There is a great feature in windows phone 8 that is kids corner, it is a privacy and protection mechanism that keeps kids from the main course of phone and give them there own space to play and learn.

The point is “You cannot password protect your phone main area while using kids corner, in fact both gets password protected.” Good way could be that if system is password protected, kids corner should be opened easily so kids can do there stuff without getting on your nerves each and every minute.

May be they can easy out this flow in later builds.