[Zope] how access zclass subfolders from an instance ??

hello i've created a zClass (folder,objectmanager are the superclasses) i created a folder in the zClass and placed an image there from an instance of the zClass i cant access the image, i get an permission denied error with the permissions, everything should be ok, cause i'm logged in as admin if i put the image in the root folder of the zClass it works just fine but i want to organize various contents with folders can anybody help thx bd