--- a/dialogs/BlockPreviewDialog.py	Wed Jul 31 10:45:07 2013 +0900
+++ b/dialogs/BlockPreviewDialog.py	Mon Nov 18 12:12:31 2013 +0900
@@ -170,10 +170,10 @@
         """
         # Get list of variables defined in POU
         self.VariableList = {
-            var["Name"]: (var["Class"], var["Type"])
+            var.Name: (var.Class, var.Type)
             for var in self.Controller.GetEditedElementInterfaceVars(
                                                         self.TagName)
-            if var["Edit"]}
+            if var.Edit}
         
         # Add POU name to variable list if POU is a function 
         returntype = self.Controller.GetEditedElementInterfaceReturnType(