I have a simple text box for which I need to perform some operations
when it looses focus. It is relatively simple using the old
addFocusListener API:

            TextBox txtBox = new TextBox();
            txtBox.addFocusListener(new FocusListener() {

                @Override
                public void onFocus(Widget sender) {
                    // do nothing
                }

                @Override
                public void onLostFocus(Widget sender) {
                    // do some stuff
                }
            });
But I can't figure out how to do it using the new addFocusHandler API
because there is only the onFocus method to implement. Any help is
appreciated. Thanks in advance.
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