Index: wp-includes/nav-menu-template.php
===================================================================
--- wp-includes/nav-menu-template.php	(revision 15073)
+++ wp-includes/nav-menu-template.php	(working copy)
@@ -209,7 +209,7 @@
 	global $_wp_nav_menu_slugs;
 	$defaults = array( 'menu' => '', 'container' => 'div', 'container_class' => '', 'container_id' => '', 'menu_class' => 'menu', 
 	'echo' => true, 'fallback_cb' => 'wp_page_menu', 'before' => '', 'after' => '', 'link_before' => '', 'link_after' => '',
-	'depth' => 0, 'walker' => '', 'context' => 'frontend', 'theme_location' => '' );
+	'depth' => 0, 'walker' => '', 'context' => array( 'frontend' ), 'theme_location' => '' );
 
 	$args = wp_parse_args( $args, $defaults );
 	$args = apply_filters( 'wp_nav_menu_args', $args );
@@ -258,7 +258,7 @@
 	}
 
 	// Set up the $menu_item variables
-	if ( 'frontend' == $args->context )
+	if ( in_array( 'frontend', (array)$args->context ) )
 		_wp_menu_item_classes_by_context( $menu_items );
 
 	$sorted_menu_items = array();