WPF ChromiumWebBrowser Load before attaching to visual tree

CustomChromiumWebBrowser.cs

using CefSharp.Wpf;
using System;

namespace CefSharp.MinimalExample.Wpf
{
    /// <summary>
    /// ChromiumWebBrowser that loads before being attached to the visual tree
    /// </summary>
    /// <example>
    /// <code>
    /// //Obtain Hwnd from parent window
    /// var hwndSource = (HwndSource)PresentationSource.FromVisual(this);
    /// var browser = new CustomChromiumWebBrowser(hwndSource.Handle, "github.com", 1024, 768);
    /// </code>
    /// </example>
    public class CustomChromiumWebBrowser : ChromiumWebBrowser
    {
        private readonly IntPtr parentWindowHandle;

        public CustomChromiumWebBrowser(IntPtr parentWindowHandle, string address, int width, int height) : base(address)
        {
            this.parentWindowHandle = parentWindowHandle;
            CreateOffscreenBrowser(new System.Windows.Size(width, height));

            Loaded += OnCustomChromiumWebBrowserLoaded;
        }

        private void OnCustomChromiumWebBrowserLoaded(object sender, System.Windows.RoutedEventArgs e)
        {
            Loaded -= OnCustomChromiumWebBrowserLoaded;

            //If the browser has finished rendering before we attach to the Visual Tree
            //then ask for a new frame to be generated
            var host = this.GetBrowserHost();
            if (host != null)
            {
                host.Invalidate(PaintElementType.View);
            }
        }

        protected override IWindowInfo CreateOffscreenBrowserWindowInfo(IntPtr handle)
        {
            //If we aren't attached to the Visual Tree when the browser is created
            //Then we should use the parentWindowHandle(HWND) passed in to the constructor
            return base.CreateOffscreenBrowserWindowInfo(handle == IntPtr.Zero ? parentWindowHandle : handle);
        }
    }
}

MainWindow.cs

using System.Windows;
using System.Windows.Interop;

namespace CefSharp.MinimalExample.Wpf
{
    public partial class MainWindow : Window
    {
        public MainWindow()
        {
            InitializeComponent();

            Loaded += OnMainWindowLoaded;
        }

        private void OnMainWindowLoaded(object sender, RoutedEventArgs e)
        {
            var hwndSource = (HwndSource)PresentationSource.FromVisual(this);

            var browser = new CustomChromiumWebBrowser(hwndSource.Handle, "github.com", 1024, 768);

            browser.LoadingStateChanged += OnBrowserLoadingStateChanged;
        }

        private void OnBrowserLoadingStateChanged(object sender, LoadingStateChangedEventArgs e)
        {
            if (e.IsLoading == false)
            {
                var browser = (CustomChromiumWebBrowser)sender;
                browser.LoadingStateChanged -= OnBrowserLoadingStateChanged;
                Dispatcher.InvokeAsync(() =>
                {
                    //Attach to visual tree
                    BrowserBorder.Child = browser;
                });
            }
        }
    }
}