DB_DataObject_FormBuilder: Group Handling

Hi, I'm trying to add a QuickForm Group for a File Upload Field in Formbuilder. The Field is represented as varchar field in the table and should save the file extension. I have an own DataObject Class where I want to put standard methods for forms, and also for file upload fields. For each file upload field I want to generate a group of elements with the field on it's own, a link to show the uploaded file (if something is uploaded) and a checkbox to delete a existing upload file. While experimenting with FormBuilder I noticed that I can 1) Use preDefElements with arrays to create the group like public function preGenerateForm($fb) { if (isset($fb->_do->fb_fileUploadFields)) { foreach ($fb->_do->fb_fileUploadFields as $uploadFieldName => $uploadField) { $fb->_do->fb_preDefElements[$uploadFieldName] = array( HTML_QuickForm::createElement('file', $uploadFieldName), HTML_QuickForm::createElement('text', 'blah') ); Now a Group is created, but I can't edit the group seperator, and the field names in the form are not like group[element_name]. fb_fileUploadFields is my own variable that indicates which fields are upload fields. 2. Use preDefGroups I do not understand, why the array is name => group and not, group_name => array of elements. This would imho make more sence. Thx for your help!