[Zope] External Method to dtml Method

Hi, Can somebody help me with translating of Jon Udell's External Method (Calendar-tag example) to a dtml method? ----- def editCalendarProperty(self,REQUEST,RESPONSE): if ( self.hasProperty(REQUEST['prop']) ): self.manage_changeProperties({ REQUEST['prop'] : REQUEST['propval'] }) else: self.manage_addProperty(REQUEST['prop'], REQUEST['propval'], 'string') return REQUEST.RESPONSE.redirect(REQUEST['BASE2']) ------ Thanks in advance! Tom