public void checkItem(ToDoItem item) {
        if (mClient == null) {
            return;
        }

        // Ustawienie flagi 'completed' i aktualizacja tabeli
        item.setComplete(true);

        mToDoTable.update(item, new TableOperationCallback<ToDoItem>() {

            public void onCompleted(ToDoItem entity, Exception exception, ServiceFilterResponse response) {
                if (exception == null) {
                    if (entity.isComplete()) {
                        mAdapter.remove(entity);
                    }
                } else {
                    createAndShowDialog(exception, "Error");
                }
            }

        });
    }