diff --git a/Lib/idlelib/Bindings.py b/Lib/idlelib/Bindings.py
index a3c9fc4..1853ff9 100644
--- a/Lib/idlelib/Bindings.py
+++ b/Lib/idlelib/Bindings.py
@@ -10,6 +10,7 @@
 """
 import sys
 from configHandler import idleConf
+import macosxSupport
 
 menudefs = [
  # underscore prefixes character to underscore
@@ -80,8 +81,7 @@
    ]),
 ]
 
-import sys
-if sys.platform == 'darwin' and '.app' in sys.executable:
+if macosxSupport.runningAsOSXApp():
     # Running as a proper MacOS application bundle. This block restructures
     # the menus a little to make them conform better to the HIG.
 
diff --git a/Lib/idlelib/EditorWindow.py b/Lib/idlelib/EditorWindow.py
index 0b34242..5848c02 100644
--- a/Lib/idlelib/EditorWindow.py
+++ b/Lib/idlelib/EditorWindow.py
@@ -368,7 +368,7 @@
             menudict[name] = menu = Menu(mbar, name=name)
             mbar.add_cascade(label=label, menu=menu, underline=underline)
 
-        if sys.platform == 'darwin' and '.framework' in sys.executable:
+        if macosxSupport.runningAsOSXApp():
             # Insert the application menu
             menudict['application'] = menu = Menu(mbar, name='apple')
             mbar.add_cascade(label='IDLE', menu=menu)
diff --git a/Lib/idlelib/MultiCall.py b/Lib/idlelib/MultiCall.py
index 51de639..b228f57 100644
--- a/Lib/idlelib/MultiCall.py
+++ b/Lib/idlelib/MultiCall.py
@@ -33,6 +33,7 @@
 import string
 import re
 import Tkinter
+import macosxSupport
 
 # the event type constants, which define the meaning of mc_type
 MC_KEYPRESS=0; MC_KEYRELEASE=1; MC_BUTTONPRESS=2; MC_BUTTONRELEASE=3;
@@ -45,7 +46,7 @@
 MC_OPTION = 1<<6; MC_COMMAND = 1<<7
 
 # define the list of modifiers, to be used in complex event types.
-if sys.platform == "darwin" and sys.executable.count(".app"):
+if macosxSupport.runningAsOSXApp():
     _modifiers = (("Shift",), ("Control",), ("Option",), ("Command",))
     _modifier_masks = (MC_SHIFT, MC_CONTROL, MC_OPTION, MC_COMMAND)
 else:
diff --git a/Lib/idlelib/configDialog.py b/Lib/idlelib/configDialog.py
index acab053..2f66d09 100644
--- a/Lib/idlelib/configDialog.py
+++ b/Lib/idlelib/configDialog.py
@@ -19,6 +19,7 @@
 from keybindingDialog import GetKeysDialog
 from configSectionNameDialog import GetCfgSectionNameDialog
 from configHelpSourceEdit import GetHelpSourceDialog
+import macosxSupport
 
 class ConfigDialog(Toplevel):
 
@@ -69,18 +70,25 @@
                 page_names=['Fonts/Tabs','Highlighting','Keys','General'])
         frameActionButtons = Frame(self,pady=2)
         #action buttons
+        if macosxSupport.runningAsOSXApp():
+            # Changing the default padding on OSX results in unreadable
+            # text in the buttons
+            paddingArgs={}
+        else:
+            paddingArgs={'padx':6, 'pady':3}
+
         self.buttonHelp = Button(frameActionButtons,text='Help',
                 command=self.Help,takefocus=FALSE,
-                padx=6,pady=3)
+                **paddingArgs)
         self.buttonOk = Button(frameActionButtons,text='Ok',
                 command=self.Ok,takefocus=FALSE,
-                padx=6,pady=3)
+                **paddingArgs)
         self.buttonApply = Button(frameActionButtons,text='Apply',
                 command=self.Apply,takefocus=FALSE,
-                padx=6,pady=3)
+                **paddingArgs)
         self.buttonCancel = Button(frameActionButtons,text='Cancel',
                 command=self.Cancel,takefocus=FALSE,
-                padx=6,pady=3)
+                **paddingArgs)
         self.CreatePageFontTab()
         self.CreatePageHighlight()
         self.CreatePageKeys()
diff --git a/Lib/idlelib/keybindingDialog.py b/Lib/idlelib/keybindingDialog.py
index 1ce7ff4..d6d1f18 100644
--- a/Lib/idlelib/keybindingDialog.py
+++ b/Lib/idlelib/keybindingDialog.py
@@ -132,8 +132,8 @@
         order is also important: key binding equality depends on it, so
         config-keys.def must use the same ordering.
         """
-        import sys
-        if sys.platform == 'darwin' and sys.argv[0].count('.app'):
+        import macosxSupport
+        if macosxSupport.runningAsOSXApp():
             self.modifiers = ['Shift', 'Control', 'Option', 'Command']
         else:
             self.modifiers = ['Control', 'Alt', 'Shift']
diff --git a/Lib/idlelib/macosxSupport.py b/Lib/idlelib/macosxSupport.py
index 279b1cc..98b35b6 100644
--- a/Lib/idlelib/macosxSupport.py
+++ b/Lib/idlelib/macosxSupport.py
@@ -6,8 +6,12 @@
 import Tkinter
 
 def runningAsOSXApp():
-    """ Returns True iff running from the IDLE.app bundle on OSX """
-    return (sys.platform == 'darwin' and 'IDLE.app' in sys.argv[0])
+    """
+    Returns True if Python is running from within an app on OSX.
+    If so, assume that Python was built with Aqua Tcl/Tk rather than
+    X11 Tck/Tk.
+    """
+    return (sys.platform == 'darwin' and '.app' in sys.executable)
 
 def addOpenEventSupport(root, flist):
     """