url issue

Hi,

so i created a new post type called Product, and disable slug rewrite.

on wordpress setting, the permanent link structure is set to the basic one, http://www.mysite.com/p?=123 (well i tried others as well)

on my default ‘post’ type, when i create a new post, the url follow the permanent link structure above. that is correct.

but on my custom post type – Product, after post is saved, the url got rewrite to http://www.mysite.com/product?=This_is_slug

how can i make our custom post type to use post id instead of slug in the url?
Thanks.