dynamic django form

I am trying to use the dynamic django form script from http://www.djangosnippets.org/snippets/714/

The dynamic form is generated, but I am having hard time retrieving submitted fields through form.开发者_C百科cleaned_data['myfield']

There are few comments on the snippet page, those didn't work either.

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Have you made sure that you have called is_valid() on the form first, and that the field is passing it's validation routines?