Custom renderer WKWebView, get/set url

Goodday,

I want to replace the default WebView for iOS by WKWebView because of the bad performance, i took the example form the Xamarin website (hybridwebview). This works when i set the url when the app is initialising, it renders fast. In the example there is an event handler on Uri, but then i change the value by settings it the OnElementChanged is not fired?

Can somebody give me some advice or am i doing something terribly wrong? (I am new to Xamarin so sorry for silly questions )

Shared part:

<br />namespace Woby
{
     public class HybridWebView : View
     {
         Action<string> action;
         public static BindableProperty UriProperty = BindableProperty.Create(
           propertyName: "Uri",
           returnType: typeof(string),
           declaringType: typeof(HybridWebView),
           defaultValue: default(string));

         public string Uri
         {
             get { return (string)GetValue(UriProperty); }
             set { SetValue(UriProperty, value); }
         }
     }
 }

Platform code (iOS):

<br />[assembly: ExportRenderer(typeof(HybridWebView), typeof(HybridWebViewRenderer))]

 namespace Woby.iOS
 {
     public class HybridWebViewRenderer : ViewRenderer<HybridWebView, WKWebView>
     {
         protected override void OnElementChanged(ElementChangedEventArgs<HybridWebView> e)
         {
             base.OnElementChanged(e);
             if (Control == null)
             {
                 var config = new WKWebViewConfiguration { };
                 var webView = new WKWebView(Frame, config);
                 SetNativeControl(webView);
             }
             if (e.OldElement != null){ }
             if (e.NewElement != null)
             {
                 if (Element.Uri != null)
                 {
                     Console.WriteLine("Changing = " + Element.Uri);
                     Control.LoadRequest(new NSUrlRequest(new NSUrl(Element.Uri)));
                 }
             }
         }
     }
 }