wp_ajax_dashboard_widgets()

function wp_ajax_dashboard_widgets() {
	require_once ABSPATH . 'wp-admin/includes/dashboard.php';

	$pagenow = $_GET['pagenow'];
	if ( $pagenow === 'dashboard-user' || $pagenow === 'dashboard-network' || $pagenow === 'dashboard' ) {
		set_current_screen( $pagenow );
	}

	switch ( $_GET['widget'] ) {
		case 'dashboard_primary' :
			wp_dashboard_primary();
			break;
		case 'dashboard_petitions' :
			cp_dashboard_petitions();
			break;
	}
	wp_die();
}