CRM 4 : Customizing Default View

We are customizing the CRM 4 installation in a client.

I've just created a new entity and attributes and want to add the new attributes to the "default public view".

I click "Add columns" and in the new window "Add Columns" that shows, in the grid, no attributes appears.

Internally we have Crm 2011, and if I try to do the same thing, in the "Add Columns" page, it displays all of the entity fields and let's me choose which I want to add.

Any Ideas?