Add collapse event to the GWT

Even though the requirement is simple, I feel that this is eating my time, i'm trying to add a collapse event to the gwt gxt combobox, i'm using the version 2.1 gwt. Any small snippet will be helpful. the version of the library that i have do not support addCollapsehandler event, i've tried to do with addHandler, i do not know how to proceed on this.

Thanks.

---

这将是正常的做法：

Listener<FieldEvent> collapseListener = new Listener<FieldEvent>() {
    @Override void handleEvent(FieldEvent fe) {
            // collapse handler here
    }
}

comboBox.addListener(Events.Collapse, collapseListener);

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