code: private void initChangeHandler() {
  	    JQMChangeHandler handler = new JQMChangeHandler() {
              @Override
              public void onEvent(JQMEvent<?> event) {
                  DomEvent.fireNativeEvent(Document.get().createChangeEvent(), input);
              }};
  	    JQMHandlerRegistration.registerJQueryHandler(new WidgetHandlerCounter() {
              @Override
              public int getHandlerCountForWidget(GwtEvent.Type<?> type) {
                  return getHandlerCount(type);
              }
          }, this, handler, JQMComponentEvents.CHANGE,
          JQMEventFactory.getType(JQMComponentEvents.CHANGE, JQMChangeHandler.class));
  	}
docs: Standard GWT ChangeEvent is not working for search input, that's why we have to activate
  it manually by listening jQuery change event.