diff -r a42f14ff0f9a Lib/idlelib/EditorWindow.py
--- a/Lib/idlelib/EditorWindow.py	Mon Aug 04 00:21:11 2014 -0700
+++ b/Lib/idlelib/EditorWindow.py	Mon Aug 04 19:54:16 2014 +0530
@@ -132,7 +132,8 @@
         except AttributeError:
             sys.ps1 = '>>> '
         self.menubar = Menu(root)
-        self.top = top = WindowList.ListedToplevel(root, menu=self.menubar)
+        self.top = top = WindowList.ListedToplevel(root, class_='IDLE',
+                                                   menu=self.menubar)
         if flist:
             self.tkinter_vars = flist.vars
             #self.top.instance_dict makes flist.inversedict available to