diff -r 5a8aa1102f82 Lib/tkinter/test/test_ttk/test_widgets.py
--- a/Lib/tkinter/test/test_ttk/test_widgets.py	Sun Oct 27 12:38:01 2013 +0200
+++ b/Lib/tkinter/test/test_ttk/test_widgets.py	Sun Oct 27 13:28:47 2013 +0200
@@ -946,12 +946,10 @@
         self.assertRaises(tkinter.TclError, self.tv.heading, '#0',
             anchor=1)
 
-    # XXX skipping for now; should be fixed to work with newer ttk
-    @unittest.skip("skipping pending resolution of Issue #10734")
     def test_heading_callback(self):
         def simulate_heading_click(x, y):
             support.simulate_mouse_click(self.tv, x, y)
-            self.tv.update_idletasks()
+            self.tv.update()
 
         success = [] # no success for now