diff -r b75b4fdd62f8 Lib/tkinter/__init__.py
--- a/Lib/tkinter/__init__.py	Wed Jun 01 00:01:21 2016 -0500
+++ b/Lib/tkinter/__init__.py	Thu Jun 02 00:06:00 2016 +0300
@@ -2113,6 +2113,7 @@ class BaseWidget(Misc):
         if self._name in self.master.children:
             self.master.children[self._name].destroy()
         self.master.children[self._name] = self
+        print(self.widgetName, self._w)
     def __init__(self, master, widgetName, cnf={}, kw={}, extra=()):
         """Construct a widget with the parent widget MASTER, a name WIDGETNAME
         and appropriate options."""