SmartGWT - addScrolledHandler

I'm using SmartGWT. I used addScrolledHandler so that 3grids can be scrolled together as below.

        firstGrid.addScrolledHandler(new ScrolledHandler() {
        @Override
        public void onScrolled(ScrolledEvent event) {
            Integer eventsToSink = firstGrid.getRowTop(event.getY());
            firstGrid.scrollToRow(eventsToSink);
            secondGrid.scrollToRow(eventsToSink);
            thirdGrid.scrollToRow(eventsToSink);
        }
    });

1. When I scrolled down the first grid, other grids also were scrolled. However, it doesn't scroll up after then.

2. I found this message. "Unable to preventDefault inside passive event listener due to target being treated as passive. See "

3. Regarding this message, I checked and found that I have to set passive value to false. However, I am not sure how I can do that when using smartGWT..