[Plugin: NextGEN Gallery] Display Gallery in blog 1 from blog 2

I’m trying to insert a gallery of blog 2, in the main blog.

<?php echo nggShowRandomRecent ('', 5,'', 1); ?>

This function works correctly for the same blog.

so I tried this:

<?php switch_to_blog (2);
echo nggShowRandomRecent ('', 5,'', 1);
  restore_current_blog (); ?>

but does not work.

with all other functions, I resolved with switch_to_blog ().

I looked at the plugin code, but I do not understand why not use the tables of the blog 2, to make the query.

http://wordpress.org/extend/plugins/nextgen-gallery/