[Zope] wrong redirection after save properties tab

Hi, i have a problem by using zope products. i wrote a product with edit and properties tabs. when i press the 'Save Changes' Button on the property tab the method manage_editProperties from the inherited class PropertyManager is called. after that i will redirect to the edit tab (i see it in the manage_tabs) but with content from the properties tab. whats wrong in my product. i do not implement manage_editProperties. I use the inherited method from PropertyManager Class. i use Zope 2.6.0 sorry for my bad english...