Avalonia/samples/Sandbox/MainWindow.axaml.cs

using System.ComponentModel;
using System.Diagnostics;
using System.Runtime.CompilerServices;
using Avalonia;
using Avalonia.Controls;
using Avalonia.Controls.Documents;
using Avalonia.Controls.Presenters;
using Avalonia.Interactivity;
using Avalonia.Markup.Xaml;
using Avalonia.VisualTree;

namespace Sandbox
{
    public class MainWindow : Window
    {
        public MainWindow()
        {
            this.InitializeComponent();
            this.AttachDevTools();        
        }

        private void InitializeComponent()
        {
            AvaloniaXamlLoader.Load(this);
        }
    }    
}