Pass a root to the help window.
diff --git a/Tools/idle/PopupMenu.py b/Tools/idle/PopupMenu.py
index d08b18d..82ee8e5 100644
--- a/Tools/idle/PopupMenu.py
+++ b/Tools/idle/PopupMenu.py
@@ -83,4 +83,4 @@
 
     def help(self):
         from HelpWindow import HelpWindow
-        HelpWindow()
+        HelpWindow(root=self.flist.root)