There is no "Design" in top menu

Steps to reproduce

Create class

1. Log in as admin in admin interface
2. Click "Setup" in top menu
3. Click "Classes" in left menu
4. Click "Content" link below Class group
5. Click "New class" button
6. Enter formdata:
Name : tGoogle Map
Identifier : tgmap
Object Name Pattern : <name>
Container : Checked
7. Click "Add attribute" button (Adding a Textline attribute )
8. Enter attribute data:
Name : Name
Identifier : name
9. Select gmap in datatype dropdown and click "Add attribute" button again
10. Enter attribute data:
Name : Google map
Identifier : gmap

Create template override

1. Click "Design" in top menu
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No such link