How to implement HasValue for ListBox?

I have a custom class which is used to assign single handler to all of my UI text fields. 

Custom Class Watcher:

=================

private ValueChangeHandler<String> reusableChangeHandler;

public void registerHandlers(HasValue<String> element) {

        element.addValueChangeHandler(reusableChangeHandler);

    }

The idea here is I can assign all of my textfields same valueChangeHandler.

myView Class:

===========

TestBox myTextBox = new TextBox();

Watcher.registerHandlers(myTextBox);

But it doesn't work for ListBox. How do I make a overloaded method to accomodate Listbox?

Basically I want to do something when any of my UI elements value changes in a center location. 

 

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