Using one Magritte form for two model objects

Hi, I have a big data model that I have split into around 10 model classes, each with its own set of Magritte descriptions. Now I'd like to put several of them into a single Magritte form. In other words, I want to have the form fields of model 1 and model 2 on the same page, but only one OK and one Cancel button. What would be the simplest way to do that? I found this snippet for re-arranging fields / descriptions [1]: buildComponentFor: aModel ^((ModelClass descriptionFieldOne, ModelClass descriptionFieldTwo, ModelClass descriptionFieldThree) componentRenderer: MACssRenderer; asComponentOn: aModel) addValidatedForm; yourself but it is using a single model object. Thanks in advance Matthias [1] http://onsmalltalk.com/programming/smalltalk/using-magritte-with-seaside/