--- a/graphics/ToolTipProducer.py	Fri Sep 22 20:12:22 2017 +0300
+++ b/graphics/ToolTipProducer.py	Thu Sep 28 12:20:40 2017 +0300
@@ -32,7 +32,7 @@
 # -------------------------------------------------------------------------------
 
 
-class ToolTipProducer:
+class ToolTipProducer(object):
     """
     Class that implements an element that generate Tool Tip
     """