--- a/controls/CustomToolTip.py	Tue Oct 03 16:31:31 2017 +0300
+++ b/controls/CustomToolTip.py	Thu Oct 05 16:38:49 2017 +0300
@@ -184,7 +184,7 @@
         line_offset = 0
         for line in self.Tip:
             dc.DrawText(line, 2, line_offset + 2)
-            line_width, line_height = dc.GetTextExtent(line)
+            _line_width, line_height = dc.GetTextExtent(line)
             line_offset += line_height
 
         dc.EndDrawing()