Java SE (Java Platform, Standard Edition)

I'm adding the following code to a JTextField

        FocusListener listener = new FocusListener() {
            @Override
            public void focusGained(FocusEvent e) {
                // do nothing
            }

            @Override
            public void focusLost(FocusEvent e) {
                valueChanged();
            }
        };
        field.addFocusListener( listener);

It works great when I click around from one field to another, but when I click on a save button, the event is not called. This is a plugin to a project, so I do not have access add a listener to the button itself.

But shouldn't clicking on the button call the focusLost event?

I quickly hacked together what I thought would be a temporary solution by injecting code, but no dice.

      JTextField textField = new JTextField();
        textField.setVisible(true);
        textField.setFocusable(true);
        textField.requestFocusInWindow();
        textField.grabFocus();