diff -r b112bfdde5cc -r 5b6ad7a7fd9d editors/SFCViewer.py
--- a/editors/SFCViewer.py	Sat Aug 19 21:06:54 2017 +0300
+++ b/editors/SFCViewer.py	Mon Aug 21 21:55:18 2017 +0300
@@ -213,9 +213,9 @@
         else:
             return None
 
-#-------------------------------------------------------------------------------
-#                          Mouse event functions
-#-------------------------------------------------------------------------------
+    # -------------------------------------------------------------------------------
+    #                          Mouse event functions
+    # -------------------------------------------------------------------------------
 
     def OnViewerLeftDown(self, event):
         if self.GetDrawingMode() == FREEDRAWING_MODE:
@@ -356,9 +356,9 @@
             return False
         return True
 
-#-------------------------------------------------------------------------------
-#                          Keyboard event functions
-#-------------------------------------------------------------------------------
+    # -------------------------------------------------------------------------------
+    #                          Keyboard event functions
+    # -------------------------------------------------------------------------------
 
     def OnChar(self, event):
         if self.GetDrawingMode() == FREEDRAWING_MODE:
@@ -425,9 +425,9 @@
             else:
                 event.Skip()
 
-#-------------------------------------------------------------------------------
-#                          Adding element functions
-#-------------------------------------------------------------------------------
+    # -------------------------------------------------------------------------------
+    #                          Adding element functions
+    # -------------------------------------------------------------------------------
 
     def AddInitialStep(self, pos):
         dialog = SFCStepNameDialog(self.ParentWindow, _("Please enter step name"), _("Add a new initial step"), "", wx.OK | wx.CANCEL)
@@ -814,9 +814,9 @@
                 self.Refresh(False)
             dialog.Destroy()
 
-#-------------------------------------------------------------------------------
-#                          Delete element functions
-#-------------------------------------------------------------------------------
+    # -------------------------------------------------------------------------------
+    #                          Delete element functions
+    # -------------------------------------------------------------------------------
 
     def DeleteStep(self, step):
         if self.GetDrawingMode() == FREEDRAWING_MODE:
@@ -1076,9 +1076,9 @@
         if self.GetDrawingMode() == FREEDRAWING_MODE:
             Viewer.DeleteWire(self, wire)
 
-#-------------------------------------------------------------------------------
-#                          Model update functions
-#-------------------------------------------------------------------------------
+    # -------------------------------------------------------------------------------
+    #                          Model update functions
+    # -------------------------------------------------------------------------------
 
     def RefreshBlockModel(self, block):
         blockid = block.GetId()