Multiple nonce problems

Hi, I’m trying to add a Table in the Add New / Update Post section. So I’ve created that using a “add_meta_box” function an use the “WP_List_Table” class.

Everything works great but when I click on the “Publish/Update” button it returns the “Are you sure you want to do this?” message. I see (googling) that this problems it is usually because the nonce, so I’ve went to “Firebug” and I’ve saw that there are two “_wpnonce” one for the post and one for the table and the only way to solve that is edit the php file “wp-admin/includes/class-wp-list-table.php” to change the nonce name of the nonce for the table. But I think that must be a better way to do that. Any ideas?

Thanks in advance.