private void ConfigureAuthorsComboBoxes() { AuthorCombobox.SelectedIndex = Authors.IndexOf(BookView.Authors.ToList()[0]); if (BookView.Authors.Count > 1) { for (int i = 1; i < BookView.Authors.Count; i++) { AddingAuthorCombobox(this, new RoutedEventArgs()); var authorAdding = (AuthorAdding)AuthorsStackPanel.Children[i - 1]; var combobox = authorAdding.AuthorComboBox; combobox.SelectedIndex = Authors.IndexOf(BookView.Authors.ToList()[i]); } } }