Use ViewController and not Storyboard

I'm not a storyboard user; all my iOS a[ps use xib's. I'm going to write a Mac companion app using xib's as well. When I create a new ViewController (I called it ViewMain) I get three files:

ViewMain.cs
ViewMain.xib
ViewMainController.cs

The two .cs files have a .designer file. When I'm setting up outlets, where do I do it? In the ViewMain or ViewMainController? And where do I actually write my code? Can one of these .cs files be removed?

Thanks...