HTML_QuickForm - enabling/disabling group-elements before displaying form

Hi I'm using QuickForm as part of a small CMS system and need to control which submit-buttons are being displayed depending on a parameter from the user AS WELL AS results from processing the form!! It's like this: parameter action can be either "Create" or "Modify" matching the following buttons: Create -> Reset and Save buttons Modify -> Reset, Delete and Save/Update buttons this would normally be easy to do like this: //new Quickform-object //add elements, rules and stuff if ($action=='create') { //add group of create-buttons } else { //add group of modify-buttons } //process form ($form->validate, $form->process) //show form ($form->toHTML) but my problem is that when processing the form certain results/cases could change the behaviour in such a way that even though $action is 'modify' the create-buttons should be displayed!! I could move the button-group part of the code below the process-part but this somehow seems logically wrong I think. I would would rather like to enable/disable the two button groups from within the process function - is this possible!? Regards, Tommy