diff --git a/Upsilon/BoundTypes/UserDataBoundTypeDefinition.cs b/Upsilon/BoundTypes/UserDataBoundTypeDefinition.cs
index f445a43..826bb2c 100644
--- a/Upsilon/BoundTypes/UserDataBoundTypeDefinition.cs
+++ b/Upsilon/BoundTypes/UserDataBoundTypeDefinition.cs
@@ -36,7 +36,7 @@ namespace Upsilon.BoundTypes
                 Properties = new Dictionary<string, UserDataBoundProperty>(),
                 Name = name
             };
-            var fields = backingType.GetFields().Select(x => new UserDataBoundProperty()
+            var fields = backingType.GetFields(BindingFlags.Public | BindingFlags.Instance).Select(x => new UserDataBoundProperty()
             {
                 Name       = x.Name,
                 ActualType =  x.FieldType.Name,
@@ -46,7 +46,19 @@ namespace Upsilon.BoundTypes
             {
                 obj.Properties.Add(f.Name.ToLowerInvariant(), f);
             }
-            var properties = backingType.GetProperties().Select(x => new UserDataBoundProperty()
+
+            PropertyInfo[] realProperties;
+            if (backingType.IsInterface)
+            {
+                realProperties = new[]{backingType}
+                    .Concat(backingType.GetInterfaces())
+                    .SelectMany(x => x.GetProperties(BindingFlags.Public | BindingFlags.Instance)).ToArray();
+            }
+            else
+            {
+                realProperties = backingType.GetProperties(BindingFlags.Public | BindingFlags.Instance);
+            }
+            var properties = realProperties.Select(x => new UserDataBoundProperty()
             {
                 Name       = x.Name,
                 ActualType =  x.PropertyType.Name,
@@ -57,7 +69,7 @@ namespace Upsilon.BoundTypes
                 obj.Properties.Add(f.Name.ToLowerInvariant(), f);
             }
             var methods = new Dictionary<string, UserDataBoundMethod>();
-            var backingMethods = backingType.GetMethods();
+            var backingMethods = backingType.GetMethods(BindingFlags.Public | BindingFlags.Instance);
             foreach (var backingMethod in backingMethods)
             {
                 if (backingMethod.IsSpecialName)