--- a/controls/FolderTree.py	Thu Oct 04 11:25:42 2018 +0300
+++ b/controls/FolderTree.py	Thu Oct 04 12:07:16 2018 +0300
@@ -27,6 +27,7 @@
 import os
 
 import wx
+from six.moves import xrange
 
 from util.BitmapLibrary import GetBitmap