tree.addItem(secondItem);
tree.addItem(thirdItem);
final Query query = new Query();
final FindPonysCommand command = new FindPonysCommand(query);
final Result<List<Pony>> ponys = command.execute();
for (final Pony pony : ponys.getData()) {
firstItem.addItem(pony.getName());
secondItem.addItem(pony.getName());
thirdItem.addItem(pony.getName());