Added issue #48 repro

Ooui/Client.js

@@ -1,6 +1,6 @@
 // Ooui v1.0.0
 
-var debug = false;
+var debug = true;
 
 const nodes = {};
 const hasText = {};

Samples/SwitchErrorSample.cs

@@ -0,0 +1,40 @@
+using Ooui;
+using Xamarin.Forms;
+
+namespace Samples
+{
+    // From https://github.com/praeclarum/Ooui/issues/48
+    public class SwitchErrorSample : ISample
+    {
+        public string Title => "Xamarin.Forms Switch Error";
+
+        public Ooui.Element CreateElement ()
+        {
+            var layout = new StackLayout();
+            var label = new Xamarin.Forms.Label
+            {
+                Text = "Switch state goes here",
+                HorizontalTextAlignment = TextAlignment.Center
+            };
+            var sw = new Switch
+            {
+                HorizontalOptions = LayoutOptions.CenterAndExpand
+            };
+            sw.Toggled += (sender, args) =>
+            {
+                label.Text = $"Switch state is :{((Switch)sender).IsToggled}";
+            };
+            layout.Children.Add(label);
+            layout.Children.Add(sw);
+            return new ContentPage
+            {
+                Content = layout
+            }.GetOouiElement();
+        }
+
+        public void Publish()
+        {
+            UI.Publish ("/switch", CreateElement);
+        }
+    }
+}