Semi.Avalonia/demo/Semi.Avalonia.Demo/ViewModels/TabControlDemoViewModel.cs

using System.Collections.ObjectModel;
using System.Linq;
using CommunityToolkit.Mvvm.ComponentModel;

namespace Semi.Avalonia.Demo.ViewModels;

public class TabControlDemoViewModel : ObservableObject
{
    public ObservableCollection<string> Items => new(Enumerable.Range(1, 200).Select(a => "Tab " + a));
}