diff -r 6629bfa8f973 -r 83f4aa79c130 javaquery/api/src/main/java/org/apidesign/bck2brwsr/htmlpage/KOList.java
--- a/javaquery/api/src/main/java/org/apidesign/bck2brwsr/htmlpage/KOList.java	Sun Apr 14 08:24:05 2013 +0200
+++ b/javaquery/api/src/main/java/org/apidesign/bck2brwsr/htmlpage/KOList.java	Sun Apr 14 11:52:36 2013 +0200
@@ -165,7 +165,9 @@
             }
             if (toKO != null) {
                 try {
+                    Object prev = arr[i];
                     arr[i] = toKO.invoke(arr[i]);
+                    LOG.log(Level.INFO, "{0}th element {1} replaced by {2}", new Object[]{i, prev, arr[i]});
                 } catch (IllegalAccessException | InvocationTargetException ex) {
                     LOG.log(Level.SEVERE, "Problems invoking koData on " + arr[i], ex);
                 }