[Zope] 'Inherited' Security Problem

Hi All, After I upgraded to zope 2.6.0 I'm no longer able to use dtml-var to include a restricted dtml method in a non restricted dtml method. The previous versions of zope would give me the possibility to log in the see the complete page or to deny complete access. Nowadays the page gives a KeyError with the value of the restricted page. Does anyone has a solution? Greetings Ralph