XplorePlane/XplorePlane/Views/Main/LibraryVersionsWindow.xaml.cs

using System.Windows;
using System.Windows.Data;
using XplorePlane.ViewModels;

namespace XplorePlane.Views
{
    public partial class LibraryVersionsWindow : Window
    {
        public LibraryVersionsWindow()
        {
            InitializeComponent();
            DataContext = new LibraryVersionsViewModel();
            Loaded += OnLoaded;
        }

        private void OnLoaded(object sender, RoutedEventArgs e)
        {
            if (DataContext is LibraryVersionsViewModel vm)
            {
                var view = CollectionViewSource.GetDefaultView(vm.Libraries);
                view.GroupDescriptions.Clear();
                view.GroupDescriptions.Add(new PropertyGroupDescription("Category"));
            }
        }

        private void CloseButton_Click(object sender, RoutedEventArgs e)
        {
            Close();
        }
    }
}