Rebase and make it run

Author: jfversluis

Xamarin.Forms.Core/RadioButton.cs

@@ -6,8 +6,10 @@
 namespace Xamarin.Forms
 {
 	[RenderWith(typeof(_RadioButtonRenderer))]
-	public partial class RadioButton : Button
+	public partial class RadioButton : Button, IElementConfiguration<RadioButton>
 	{
+		readonly Lazy<PlatformConfigurationRegistry<RadioButton>> _platformConfigurationRegistry;
+
 		static Dictionary<string, List<WeakReference<RadioButton>>> _groupNameToElements;
 
 		public const string IsCheckedVisualState = "IsChecked";
@@ -41,6 +43,16 @@ public ImageSource ButtonSource
 			set { SetValue(ButtonSourceProperty, value); }
 		}
 
+		public RadioButton()
+		{
+			_platformConfigurationRegistry = new Lazy<PlatformConfigurationRegistry<RadioButton>>(() => new PlatformConfigurationRegistry<RadioButton>(this));
+		}
+
+		public new IPlatformElementConfiguration<T, RadioButton> On<T>() where T : IConfigPlatform
+		{
+			return _platformConfigurationRegistry.Value.On<T>();
+		}
+
 		protected internal override void ChangeVisualState()
 		{
 			if (IsEnabled && IsChecked)
@@ -170,4 +182,4 @@ static Element GetVisualRoot(Element element)
 			return parent;
 		}
 	}
-}
+}