private void AddBook_Click(object sender, RoutedEventArgs e)
{
NewBook newbook = new NewBook(ref viewModel);
newbook.ShowDialog();
settingsButton.ContextMenu.IsEnabled = false;
}
private void EditButton_Click(object sender, RoutedEventArgs e)
{
viewModel.NewBook = new BookViewModel(new BusinessLogic.Book(viewModel.SelectedBook.SBook.GetModel()));
viewModel.edit = true;
NewBook newBook = new NewBook(ref viewModel);
newBook.ShowDialog();
}