Adding fields

I'm trying to do something super simple: add a public GameObject field to the DemoManager.cs file.

something like this: public string test;

this should show in the inspector, right? It isn't. No matter what I set the access modifier to, or if I use [SerializeField] or not. I cannot get anything to show in the inspector, anyone have an idea as to what I'm missing here? I can do it with a different project, so I know it's not my config or unity or visual studio.
 
The DemoManagerInspector is an editor class that handles drawing for the DemoManager. There are many of these type of classes within the controller and it allows for a custom inspector.
 
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