private void DeleteCriteriaButton(object sender, RoutedEventArgs e)
        {
            int id = CriteriasListBox.SelectedIndex;

            if (id != -1)
            {
                criterias.RemoveCriteria(id);
                foreach (var item in Alternatives)
                {
                    item.RemoveParameter(id);
                }
                InitializeListBoxes();
                InitializeTreeView();
            }
        }