Microsoft Advertising SDK

It goes without saying that everybody want to be rewarded for his job. As for me, I want to earn some money by showing advertisements in my game. I'm inspired to use this kind of monetization by this blogpost. 

Since I'm developing my game for WP7 on XNA I've decided to use Microsoft Advertising SDK for WP7. 

How to add screen to GSM

I bumped into a small but a really annoying problem when I was playing around with the GSM at first time. The problem was about adding a new screen.