diff -r 82ccdf2df5ac Lib/idlelib/AutoCompleteWindow.py
--- a/Lib/idlelib/AutoCompleteWindow.py	Tue Jul 28 00:06:31 2015 +0300
+++ b/Lib/idlelib/AutoCompleteWindow.py	Sun Aug 02 11:36:41 2015 +0300
@@ -2,6 +2,7 @@
 An auto-completion window for IDLE, used by the AutoComplete extension
 """
 from tkinter import *
+from idlelib.ttkcompat import Scrollbar
 from idlelib.MultiCall import MC_SHIFT
 from idlelib.AutoComplete import COMPLETE_FILES, COMPLETE_ATTRIBUTES
 
diff -r 82ccdf2df5ac Lib/idlelib/Debugger.py
--- a/Lib/idlelib/Debugger.py	Tue Jul 28 00:06:31 2015 +0300
+++ b/Lib/idlelib/Debugger.py	Sun Aug 02 11:36:41 2015 +0300
@@ -1,6 +1,7 @@
 import os
 import bdb
 from tkinter import *
+from idlelib.ttkcompat import Scrollbar
 from idlelib.WindowList import ListedToplevel
 from idlelib.ScrolledList import ScrolledList
 from idlelib import macosxSupport
diff -r 82ccdf2df5ac Lib/idlelib/ScrolledList.py
--- a/Lib/idlelib/ScrolledList.py	Tue Jul 28 00:06:31 2015 +0300
+++ b/Lib/idlelib/ScrolledList.py	Sun Aug 02 11:36:41 2015 +0300
@@ -1,4 +1,5 @@
 from tkinter import *
+from idlelib.ttkcompat import Scrollbar
 
 class ScrolledList:
 
diff -r 82ccdf2df5ac Lib/idlelib/TreeWidget.py
--- a/Lib/idlelib/TreeWidget.py	Tue Jul 28 00:06:31 2015 +0300
+++ b/Lib/idlelib/TreeWidget.py	Sun Aug 02 11:36:41 2015 +0300
@@ -16,7 +16,7 @@
 
 import os
 from tkinter import *
-
+from idlelib.ttkcompat import Scrollbar
 from idlelib import ZoomHeight
 from idlelib.configHandler import idleConf
 
diff -r 82ccdf2df5ac Lib/idlelib/compat.py
--- /dev/null	Thu Jan 01 00:00:00 1970 +0000
+++ b/Lib/idlelib/compat.py	Sun Aug 02 11:36:41 2015 +0300
@@ -0,0 +1,24 @@
+import tkinter
+from tkinter import ttk
+
+use_ttk = None
+
+def check_ttk(master):
+    global use_ttk
+    if use_ttk is None:
+        master = ttk.setup_master(master)
+        try:
+            if not getattr(master, '_tile_loaded', False):
+                # Load tile now, if needed
+                ttk._load_tile(master)
+        except tkinter.TclError:
+            use_ttk = False
+        else:
+            use_ttk = True
+    return use_ttk
+
+def Scrollbar(master, *args, **kwargs):
+    if check_ttk(master):
+        return ttk.Scrollbar(master, *args, **kwargs)
+    else:
+        return tkinter.Scrollbar(master, *args, **kwargs)
diff -r 82ccdf2df5ac Lib/idlelib/configDialog.py
--- a/Lib/idlelib/configDialog.py	Tue Jul 28 00:06:31 2015 +0300
+++ b/Lib/idlelib/configDialog.py	Sun Aug 02 11:36:41 2015 +0300
@@ -10,6 +10,7 @@ Refer to comments in EditorWindow autoin
 
 """
 from tkinter import *
+from idlelib.ttkcompat import Scrollbar
 import tkinter.messagebox as tkMessageBox
 import tkinter.colorchooser as tkColorChooser
 import tkinter.font as tkFont
diff -r 82ccdf2df5ac Lib/idlelib/idle_test/htest.py
--- a/Lib/idlelib/idle_test/htest.py	Tue Jul 28 00:06:31 2015 +0300
+++ b/Lib/idlelib/idle_test/htest.py	Sun Aug 02 11:36:41 2015 +0300
@@ -68,6 +68,7 @@ OutputWindow.OutputWindow (indirectly be
 from importlib import import_module
 from idlelib.macosxSupport import _initializeTkVariantTests
 import tkinter as tk
+from idlelib.ttkcompat import Scrollbar
 
 AboutDialog_spec = {
     'file': 'aboutDialog',
@@ -347,7 +348,7 @@ def run(*tests):
     frameLabel.pack()
     text = tk.Text(frameLabel, wrap='word')
     text.configure(bg=root.cget('bg'), relief='flat', height=4, width=70)
-    scrollbar = tk.Scrollbar(frameLabel, command=text.yview)
+    scrollbar = Scrollbar(frameLabel, command=text.yview)
     text.config(yscrollcommand=scrollbar.set)
     scrollbar.pack(side='right', fill='y', expand=False)
     text.pack(side='left', fill='both', expand=True)
diff -r 82ccdf2df5ac Lib/idlelib/keybindingDialog.py
--- a/Lib/idlelib/keybindingDialog.py	Tue Jul 28 00:06:31 2015 +0300
+++ b/Lib/idlelib/keybindingDialog.py	Sun Aug 02 11:36:41 2015 +0300
@@ -2,6 +2,7 @@
 Dialog for building Tkinter accelerator key bindings
 """
 from tkinter import *
+from idlelib.ttkcompat import Scrollbar
 import tkinter.messagebox as tkMessageBox
 import string
 import sys
diff -r 82ccdf2df5ac Lib/idlelib/textView.py
--- a/Lib/idlelib/textView.py	Tue Jul 28 00:06:31 2015 +0300
+++ b/Lib/idlelib/textView.py	Sun Aug 02 11:36:41 2015 +0300
@@ -3,6 +3,7 @@
 """
 
 from tkinter import *
+from idlelib.ttkcompat import Scrollbar
 import tkinter.messagebox as tkMessageBox
 
 class TextViewer(Toplevel):
@@ -50,7 +51,11 @@ class TextViewer(Toplevel):
         self.buttonOk = Button(frameButtons, text='Close',
                                command=self.Ok, takefocus=FALSE)
         self.scrollbarView = Scrollbar(frameText, orient=VERTICAL,
-                                       takefocus=FALSE, highlightthickness=0)
+                                       takefocus=FALSE)
+        try:
+            self.scrollbarView['highlightthickness']=0
+        except TclError:
+            pass
         self.textView = Text(frameText, wrap=WORD, highlightthickness=0,
                              fg=self.fg, bg=self.bg)
         self.scrollbarView.config(command=self.textView.yview)
diff -r 82ccdf2df5ac Lib/idlelib/ttkcompat.py
--- /dev/null	Thu Jan 01 00:00:00 1970 +0000
+++ b/Lib/idlelib/ttkcompat.py	Sun Aug 02 11:36:41 2015 +0300
@@ -0,0 +1,24 @@
+import tkinter
+from tkinter import ttk
+
+use_ttk = None
+
+def check_ttk(master):
+    global use_ttk
+    if use_ttk is None:
+        master = ttk.setup_master(master)
+        try:
+            if not getattr(master, '_tile_loaded', False):
+                # Load tile now, if needed
+                ttk._load_tile(master)
+        except tkinter.TclError:
+            use_ttk = False
+        else:
+            use_ttk = True
+    return use_ttk
+
+def Scrollbar(master, *args, **kwargs):
+    if check_ttk(master):
+        return ttk.Scrollbar(master, *args, **kwargs)
+    else:
+        return tkinter.Scrollbar(master, *args, **kwargs)