[Zope] Newbie question: updating properties

Hi! Happy New Year! I have a property x type int with value 1 The following piece of dtml code: <dtml-var x>, <dtml-call "manage_changeProperties(x=2)"> <dtml-var x>, <dtml-var "this().getProperty('x')"> prints 1,1,2 I wonder why it doesn't print 1,2,2 Why is the new property value not reflected in the dtml-var? anyone any idea's? Thanks, Wim.