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expected behavior of addDataArrivedHandler

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What is the expected behavior of addDataArrivedHandler if a DataArrivedHandler has already been registered to a grid ? i.e. :
Code:

grid.addDataArrivedHandler(new DataArrivedHandler() {

                        @Override
                        public void onDataArrived(DataArrivedEvent event) {
                        // do stuff       
                        }
                });
grid.addDataArrivedHandler(new DataArrivedHandler() {

                        @Override
                        public void onDataArrived(DataArrivedEvent event) {
                        // do more stuff       
                        }
                });

Should both handlers be firing? or does the 2nd call replace the first handler? I'm using the 01/13 nightly build of SmartGWT4.1d if that is relevant.

thanks,
dan

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