JavaFX 8, ListView with Checkboxes

I want to create a simple ListView. I have figured out I can use the method setCellFactory() but I don't understand how to use them correctly. So far I have:

myListView.setCellFactory(CheckBoxListCell.forListView(property));

With "property" being something called a Callback--I think Callback has something to do with bidirectional bounding. So I created a

property = new CallBack<String, ObservableValue<Boolean>>();

My compiler is telling me if I create a new Callback, I need to overwrite the method call.

And here I am stuck. What do I do with that method call? I can implement it, but what should I return, or use it for? I want to click my checkbox on any listItem and have it display "hi" in console.