Here is how I did it.
1. Create a new class (the name should be the same as exists in the
external method)
2. Tag the new class with the  "import_from" tag, the tagged value
should be the path to the file containing the class
3. Create a generaliztion from your custom class to the new imported
class, Now you can use that class in the code

Another approach is to use the "imports" tag
something like:
imports    ->    from Products.Archetypes.public import DisplayList
(without the ->)

<<attachment: screenshot-argo.jpg>>

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