Switch to side-by-side view

--- a/src/Common/CongestionDescriptor.cc
+++ b/src/Common/CongestionDescriptor.cc
@@ -14,6 +14,8 @@
 // 
 
 #include <CongestionDescriptor.h>
+
+Register_Class(CongestionDescriptor);
 
 CongestionDescriptor::CongestionDescriptor()
 {