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it's possible, but I'm afraid you'll need to implement it by yourself. the problem is Grid is not spreadsheet, it's not intentionally designed for "matrix inputs" idea. the conceptual sample code might looks like this:

textbox.setCtrlKeys("#up#down");
    textbox.addEventListener(Events.ON_CTRL_KEY, new EventListener() {      
        public void onEvent(Event event) throws Exception {
                       // do DOWN or UP logic....
                 }
        });

the textbox is a cell inside a grid's row.