key relation doesnt populate list

Hi!

Im trying to make a really simple model that consists of two tables; ItemType and Item. The relationship is that Item will always be some kind of ItemType.
But when I select the ItemType from the database the Items property doesnt get populated and contains 0 elements.

ItemType

    public class ItemType
    {
        public int Id { get; set; }
        public string Name { get; set; }

        public virtual ICollection<Item> Items { get; set; } = new HashSet<Item>();

        public enum ListTypes
        {
            Student = 1,
            Work = 2,
            Gamer = 3,
            Other = 4
        }
    }

Item

    public class Item
    {
        public int Id { get; set; }
        public string Name { get; set; }
        public string Graphic { get; set; }
        public decimal Price { get; set; }
        public string Description { get; set; }
        public int ItemTypeId { get; set; }
        public virtual ItemType ItemType { get; set; }
    }

 
so this is pretty basic. I want to select a ItemType and have the Items property filled with Items that has equal ItemTypeId.

this is the code where I select and use the database

    public class ItemListViewComponent : ViewComponent
    {
        private Data.TechDbContext _context;

        public ItemListViewComponent(Data.TechDbContext context)
        {
            _context = context;
        }

        public async Task<IViewComponentResult> InvokeAsync(Models.ItemType.ListTypes type)
        {
            var single = await (from t in _context.ItemTypes where t.Id == (int)type select t).FirstAsync<Models.ItemType>();

            return View(single);
        }
    }

and if its of any interest, the dbcontext

    public class TechDbContext : DbContext
    {
        public TechDbContext(DbContextOptions<TechDbContext> options) : base(options)
        {

        }

        public DbSet<ItemType> ItemTypes { get; set; }
        public DbSet<Item> Items { get; set; }

        protected override void OnModelCreating(ModelBuilder modelBuilder)
        {
            modelBuilder.Entity<ItemType>().ToTable("ItemType");
            modelBuilder.Entity<Item>().ToTable("Item");
        }
    }

Maybe I've misunderstood the concept, but this is how its supposed to work, right??

Any help will be HIGHLY appreciated, since I'm going slightly mad.