Debugging with visual studio after building a xaml project in unity

Hi guys, im having trouble debugging my code on vs2012. First of all, this is a porting project, so i have to resolve some issues already known for everyone. For example, i now have to use Windows.Networking.Sockets, or Windows.Storage. The thing is, that after building my vs xaml project, i can run the game, play it etc, but when it comes to debug, the #IF UNITY_METRO or NETFX_CORE etc directive isn't being recognized or something by the debugger. vs is actually runing my new metro code, i can see it step by step, but i can't see the current values of the variables, and i can't write code using the win 8 intellisense either. Maybe i'm missing some reference or something? I hope you can help me, and thank you in advance!