diff --git a/include/vsg/ui/UIEvent.h b/include/vsg/ui/UIEvent.h
index 4a0b375a77..b1dbdf51d0 100644
--- a/include/vsg/ui/UIEvent.h
+++ b/include/vsg/ui/UIEvent.h
@@ -33,4 +33,10 @@ namespace vsg
     };
 
     using Events = std::list<ref_ptr<UIEvent>>;
+    
+    template<typename T>
+    std::ostream& operator<<(typename std::enable_if<std::is_enum<T>::value, std::ostream>::type& stream, const T& e)
+    {
+        return stream << static_cast<typename std::underlying_type<T>::type>(e);
+    }
 } // namespace vsg