[Zope] objects not visible if owner is deletet?

Hi, ff User_C creates myZPT, i.e. gets the role Owner and I delete User_C after a while, myZPT is not visible any more, even if users (i.e. (User_A, User_B) of other roles (i.e. Role_A and Role_B ) have view-permission. Is that wanted? Do I have to change the ownership of all objects created by User_C or is there an other way to overcome this problem? -- thanks for your hints, Elena My folder structure: root | - content(SecuritySettings: View: Aquired unchecked, only Role_A and Role_B checked) | - Folder1(myZPT, SecuritySettings: View: Aquired checked) | - Folder2 | - acl_users(User_A, User_B, User_C deleted (Owner of myZPT))