The new functionality that enables class attributes to be grouped in categories is a great but it should be enhanced a little bit...

In the current version, when editing an object the categories are just displayed one after another and all closed except the default category (see attached image).
And they are opened by clicking on their names.

This is very non intuitive, users often don't notice them or forget about attributes that are in the closed categories. I got many users' bug reports where actually the problem was that users forgot about the attributes in the closed categories.

The best solution would be to group the attribute categories as tabs at the top of the page, right before the first attribute (see attached image).

This would be much more intuitive and much more in style of the whole admin2 interface.