Data Binding to CLR objects, wont work?

Okey, Ive try to solve this problem for hours now and dont, at all, know what Im doing so wrong.

Im up 2 the tutorial Data Binding to CLR Objects, and have also done exactly what it tells me to do, all the way. Which means Ive made a new C# class in VisualStudio and when I go back to Blend again, I can see the class in my projectfiles panel but when I will bind it with +CLR objects my class is not showing up there :S

Any ideas what to do? :S