[Zope] Wizards?

I am trying to create wizards but as usual I am running into problems.. To forward input to the next step I learned in the howto "Wizards made easy" that this was the way to do it: <dtml-in "REQUEST.form.items()"> <input type="hidden" name="<dtml-var sequence-key>" value="<dtml-var sequence-item>"> </dtml-in> When I type that code in however I get the following error message: Error Type: TypeError Error Value: illegal argument type for built-in operation Is the howto wrong or did I do something wrong? Wizards are prebuilt but where do I change how wizards should react. For example where do I change the caption on the "next"-button or the "title"-output? Peter