diff -r 3d7fa2257b24 -r 85ca4fa0720b editors/LDViewer.py
--- a/editors/LDViewer.py	Tue Sep 10 10:35:18 2013 +0200
+++ b/editors/LDViewer.py	Tue Sep 10 10:36:44 2013 +0200
@@ -487,7 +487,7 @@
             for var in vars:
                 if var["Class"] != "Input" and var["Type"] == "BOOL":
                     varlist.append(var["Name"])
-        returntype = self.Controler.GetEditedElementInterfaceReturnType(self.TagName, self.Debug)
+        returntype = self.Controler.GetEditedElementInterfaceReturnType(self.TagName, self.Debug)[0]
         if returntype == "BOOL":
             varlist.append(self.Controler.GetEditedElementName(self.TagName))
         dialog.SetVariables(varlist)
@@ -801,7 +801,7 @@
                             for var in vars:
                                 if var["Class"] != "Input" and var["Type"] == "BOOL":
                                     varlist.append(var["Name"])
-                        returntype = self.Controler.GetEditedElementInterfaceReturnType(self.TagName, self.Debug)
+                        returntype = self.Controler.GetEditedElementInterfaceReturnType(self.TagName, self.Debug)[0]
                         if returntype == "BOOL":
                             varlist.append(self.Controler.GetEditedElementName(self.TagName))
                         dialog.SetVariables(varlist)