Order By Parameters

Hi there, how can I use multiple orderby query -> http://core.trac.wordpress.org/ticket/17065
in concrete? I would like to sort my post by a custom field and by title. I need post with custom field before the others.
This is what I actually have:

$args = array(
					'post_type' => 'professionisti',
					'showposts' => 9,
					'paged' => $paged,
					'meta_key' => 'professionista_premium',
					'orderby' => 'meta_value title',
					'order' => 'ASC'
				);

but it show me the “professionista_premium” after default ones.