ECommandService eCommandService = context.get(ECommandService.class);
final Category lunch = eCommandService.getCategory("z.ex.view.keybindings.category");
        if (!lunch.isDefined()) {
            lunch.define("Lunch", "Actions take at lunch time.");
        }
final Command eatTaco = eCommandService.getCommand("z.ex.view.keybindings.eatTaco");
        if (!eatTaco.isDefined()) {
            eatTaco.define("Eat That Taco", "Go for the taco.", lunch);
        }

EHandlerService eHandlerService = context.get(EHandlerService.class);
final IHandler handler = new AbstractHandler() {
   public Object execute(final ExecutionEvent event) throwsExecutionException {
                System.out.println("Eat that Taco");
                return null;
            }
        };
        eHandlerService.activateHandler("z.ex.view.keybindings.eatTaco", handler);

handlerService.canExecute(cmd)