diff --git a/LightweightIocContainer/Interfaces/Registrations/IDefaultRegistration.cs b/LightweightIocContainer/Interfaces/Registrations/IDefaultRegistration.cs
index 3597927..508bc63 100644
--- a/LightweightIocContainer/Interfaces/Registrations/IDefaultRegistration.cs
+++ b/LightweightIocContainer/Interfaces/Registrations/IDefaultRegistration.cs
@@ -3,6 +3,7 @@
 // Copyright(c) 2019 SimonG. All Rights Reserved.
 
 using System;
+using LightweightIocContainer.Interfaces.Registrations.FluentProviders;
 
 namespace LightweightIocContainer.Interfaces.Registrations
 {
@@ -10,11 +11,8 @@ namespace LightweightIocContainer.Interfaces.Registrations
     /// The <see cref="IDefaultRegistration{TInterface}"/> to register a <see cref="Type"/> for the Interface it implements
     /// </summary>
     /// <typeparam name="TInterface">The <see cref="Type"/> of the interface</typeparam>
-    public interface IDefaultRegistration<TInterface> : IRegistrationBase<TInterface>
+    public interface IDefaultRegistration<TInterface> : ITypedRegistrationBase<TInterface>, IOnCreate<TInterface>
     {
-        /// <summary>
-        /// The <see cref="Type"/> that implements the <see cref="IRegistration.InterfaceType"/> that is registered with this <see cref="IRegistrationBase{TInterface}"/>
-        /// </summary>
-        Type ImplementationType { get; }
+        
     }
 }
\ No newline at end of file
diff --git a/LightweightIocContainer/Registrations/DefaultRegistration.cs b/LightweightIocContainer/Registrations/DefaultRegistration.cs
index f8c5c47..d680fc3 100644
--- a/LightweightIocContainer/Registrations/DefaultRegistration.cs
+++ b/LightweightIocContainer/Registrations/DefaultRegistration.cs
@@ -3,6 +3,7 @@
 // Copyright(c) 2019 SimonG. All Rights Reserved.
 
 using System;
+using LightweightIocContainer.Interfaces.Installers;
 using LightweightIocContainer.Interfaces.Registrations;
 
 namespace LightweightIocContainer.Registrations
@@ -11,7 +12,7 @@ namespace LightweightIocContainer.Registrations
     /// The <see cref="DefaultRegistration{TInterface}"/> to register a <see cref="Type"/> for the Interface it implements
     /// </summary>
     /// <typeparam name="TInterface">The <see cref="Type"/> of the interface</typeparam>
-    public class DefaultRegistration<TInterface> : RegistrationBase<TInterface>, IDefaultRegistration<TInterface>
+    public class DefaultRegistration<TInterface> : TypedRegistrationBase<TInterface>, IDefaultRegistration<TInterface>
     {
         /// <summary>
         /// The <see cref="DefaultRegistration{TInterface}"/> to register a <see cref="Type"/> for the Interface it implements
@@ -20,15 +21,27 @@ namespace LightweightIocContainer.Registrations
         /// <param name="implementationType">The <see cref="Type"/> of the implementation</param>
         /// <param name="lifestyle">The <see cref="Lifestyle"/> of the <see cref="RegistrationBase{TInterface}"/></param>
         public DefaultRegistration(Type interfaceType, Type implementationType, Lifestyle lifestyle)
-            : base(interfaceType, lifestyle)
+            : base(interfaceType, implementationType, lifestyle)
         {
-            ImplementationType = implementationType;
             Name = $"{InterfaceType.Name}, {ImplementationType.Name}, Lifestyle: {Lifestyle.ToString()}";
         }
 
         /// <summary>
-        /// The <see cref="Type"/> that implements the <see cref="RegistrationBase{TInterface}.InterfaceType"/> that is registered with this <see cref="RegistrationBase{TInterface}"/>
+        /// This <see cref="Action{T}"/> is invoked when an instance of this type is created.
+        /// <para>Can be set in the <see cref="IIocInstaller"/> by calling <see cref="OnCreate"/></para>
         /// </summary>
-        public Type ImplementationType { get; }
+        public Action<TInterface> OnCreateAction { get; private set; }
+
+
+        /// <summary>
+        /// Pass an <see cref="Action{T}"/> that will be invoked when an instance of this <see cref="Type"/> is created
+        /// </summary>
+        /// <param name="action">The <see cref="Action{T}"/></param>
+        /// <returns>The current instance of this <see cref="IRegistrationBase{TInterface}"/></returns>
+        public IRegistrationBase<TInterface> OnCreate(Action<TInterface> action)
+        {
+            OnCreateAction = action;
+            return this;
+        }
     }
 }
\ No newline at end of file