QF reset values of fiels to NULL and not to session entries?

Hi there I'm using QuickForm Controller and now got all up and running, but there is one little thing: how can I "reset all fields to zero"? I mean, the problem is that QFC there uses sessions and once entered and came back on them, if I reset, it resets to the last entered texts and not to NULL. Do I therefore have to kill the session or is there another way? Thanks in adance for your consideration Patrick -- Patrick Fehr Swiss Federal Institute Of Technology