--- a/controls/VariablePanel.py	Thu Oct 04 11:25:42 2018 +0300
+++ b/controls/VariablePanel.py	Thu Oct 04 12:07:16 2018 +0300
@@ -30,6 +30,7 @@
 import wx
 import wx.grid
 import wx.lib.buttons
+from six.moves import xrange
 
 from plcopen.structures import LOCATIONDATATYPES, TestIdentifier, IEC_KEYWORDS, DefaultType
 from plcopen.VariableInfoCollector import _VariableInfos