Test made on Beta2
Classes combo when creating items (Content, media, users,...) are not being filtered. Every classes are appearing (content, media, users,....)

Steps to reproduce

Verify that Class Group are related with it's structure part

1. Click on "Setup" tab on top menu
2. Click on "Classes" link in the menu on left side
3. On "Class groups", click on "Content" group class link
4. Take note of what classes are in the "Classes inside" list
5. Click on "Content structure" tab on the top menu
6. On the bottom of the page, in the classes combo box, verify that the items of the combo box are the same classes that where in the list from where notes where taken in step 4 of this test.