Navigation

Hello All,
I am attempting to create an application for Windows phone 8.1. Currently trying to have a mainpage in XAML which after clicking a button it will launch the game itself (And with navigation close it/suspend it if need be.).

I am running into an issue where Navigation through pages (I am attempting to use the “Frame” option) crashes the app when navigating to the game.

It also seems the option for NavigationService is not allowing me to continue as it is stating it does not exist.

Any ideas on a good Navigation technique? I am currently using the “Windows.Current.Content”, however this does not stop any sound from going through and it requires to have the game started before you can continue.