Index: wp-admin/admin-header.php
===================================================================
--- wp-admin/admin-header.php	(revision 21358)
+++ wp-admin/admin-header.php	(working copy)
@@ -100,9 +100,8 @@
 </script>
 
 <?php
-// If the customize-loader script is enqueued, make sure the customize
-// body classes are correct as early as possible.
-if ( wp_script_is( 'customize-loader', 'queue' ) && current_user_can( 'edit_theme_options' ) )
+// Make sure the customize body classes are correct as early as possible.
+if (  current_user_can( 'edit_theme_options' ) )
 	wp_customize_support_script();
 ?>
 
Index: wp-admin/menu.php
===================================================================
--- wp-admin/menu.php	(revision 21358)
+++ wp-admin/menu.php	(working copy)
@@ -129,17 +129,15 @@
 
 $menu[59] = array( '', 'read', 'separator2', '', 'wp-menu-separator' );
 
-if ( current_user_can( 'switch_themes') ) {
-	$menu[60] = array( __('Appearance'), 'switch_themes', 'themes.php', '', 'menu-top menu-icon-appearance', 'menu-appearance', 'div' );
-		$submenu['themes.php'][5]  = array(__('Themes'), 'switch_themes', 'themes.php');
-		if ( current_theme_supports( 'menus' ) || current_theme_supports( 'widgets' ) )
-			$submenu['themes.php'][10] = array(__('Menus'), 'edit_theme_options', 'nav-menus.php');
-} else {
-	$menu[60] = array( __('Appearance'), 'edit_theme_options', 'themes.php', '', 'menu-top menu-icon-appearance', 'menu-appearance', 'div' );
-		$submenu['themes.php'][5]  = array(__('Themes'), 'edit_theme_options', 'themes.php');
-		if ( current_theme_supports( 'menus' ) || current_theme_supports( 'widgets' ) )
-			$submenu['themes.php'][10] = array(__('Menus'), 'edit_theme_options', 'nav-menus.php' );
-}
+$appearance_cap = current_user_can( 'switch_themes') ? 'switch_themes' : 'edit_theme_options';
+
+$menu[60] = array( __('Appearance'), $appearance_cap, 'themes.php', '', 'menu-top menu-icon-appearance', 'menu-appearance', 'div' );
+	$submenu['themes.php'][4] = array( __( 'Customize' ), $appearance_cap, 'customize.php', 'hide-if-no-customize' ); 
+	$submenu['themes.php'][5] = array(__('Themes'), $appearance_cap, 'themes.php');
+	if ( current_theme_supports( 'menus' ) || current_theme_supports( 'widgets' ) )
+		$submenu['themes.php'][10] = array(__('Menus'), 'edit_theme_options', 'nav-menus.php');
+
+unset( $appearance_cap );
 
 // Add 'Editor' to the bottom of the Appearance menu.
 if ( ! is_multisite() )
Index: wp-admin/menu-header.php
===================================================================
--- wp-admin/menu-header.php	(revision 21358)
+++ wp-admin/menu-header.php	(working copy)
@@ -53,7 +53,7 @@
 			$class[] = 'wp-has-submenu';
 			$submenu_items = $submenu[$item[2]];
 		}
-
+		
 		if ( ( $parent_file && $item[2] == $parent_file ) || ( empty($typenow) && $self == $item[2] ) ) {
 			$class[] = ! empty( $submenu_items ) ? 'wp-has-current-submenu wp-menu-open' : 'current';
 		} else {
@@ -80,7 +80,9 @@
 		if ( false !== strpos( $class, 'wp-menu-separator' ) ) {
 			echo '<div class="separator"></div>';
 		} elseif ( $submenu_as_parent && ! empty( $submenu_items ) ) {
-			$submenu_items = array_values( $submenu_items );  // Re-index.
+			$temp_submenu_items = $submenu_items = array_values( $submenu_items );  // Re-index.
+			if ( 'customize.php' == $submenu_items[0][2] )
+				$submenu_items[0][2] = 'themes.php';
 			$menu_hook = get_plugin_page_hook( $submenu_items[0][2], $item[2] );
 			$menu_file = $submenu_items[0][2];
 			if ( false !== ( $pos = strpos( $menu_file, '?' ) ) )
@@ -91,6 +93,7 @@
 			} else {
 				echo "\n\t<div class='wp-menu-image'><a href='{$submenu_items[0][2]}' tabindex='-1' aria-label='$aria_label'>$img</a></div>$arrow<a href='{$submenu_items[0][2]}'$class $aria_attributes>$title</a>";
 			}
+			$submenu_items = $temp_submenu_items;
 		} elseif ( ! empty( $item[2] ) && current_user_can( $item[1] ) ) {
 			$menu_hook = get_plugin_page_hook( $item[2], 'admin.php' );
 			$menu_file = $item[2];
@@ -103,7 +106,7 @@
 				echo "\n\t<div class='wp-menu-image'><a href='{$item[2]}' tabindex='-1' aria-label='$aria_label'>$img</a></div>$arrow<a href='{$item[2]}'$class $aria_attributes>{$item[0]}</a>";
 			}
 		}
-
+		
 		if ( ! empty( $submenu_items ) ) {
 			echo "\n\t<div class='wp-submenu'><div class='wp-submenu-wrap'>";
 			echo "<div class='wp-submenu-head'>{$item[0]}</div><ul>";
@@ -137,6 +140,9 @@
 				) {
 					$class[] = 'current';
 				}
+				
+				if ( ! empty( $sub_item[3] ) )
+					$class[] = $sub_item[3];
 
 				$class = $class ? ' class="' . join( ' ', $class ) . '"' : '';
 
Index: wp-admin/includes/menu.php
===================================================================
--- wp-admin/includes/menu.php	(revision 21358)
+++ wp-admin/includes/menu.php	(working copy)
@@ -73,7 +73,7 @@
 	$new_parent = $first_sub[2];
 	// If the first submenu is not the same as the assigned parent,
 	// make the first submenu the new parent.
-	if ( $new_parent != $old_parent ) {
+	if ( $new_parent != $old_parent && 'customize.php' != $new_parent ) {
 		$_wp_real_parent_file[$old_parent] = $new_parent;
 		$menu[$id][2] = $new_parent;