[Zope] Problems with icons in ZClass instance (Q1959)

Hi, I tried to create CD instances as described in the ZClasses tutorial. In the Basic view of '/Control_Panel/Products/CDProduct/CDClass' I selected an image file from my computer by clicking the Browse button. The icon looks perfect. However when i try to create an instance of my ZClass in the root folder, all it's ok except it diplays a completly different logo. What's wrong?