diff --git a/CHANGELOG.md b/CHANGELOG.md
index 6662821..13af997 100644
--- a/CHANGELOG.md
+++ b/CHANGELOG.md
@@ -1,3 +1,9 @@
+2.2 - 2023.07.30
+* require Dotclear 2.27
+* require PHP 7.4+
+* use new svg icon
+* update to Dotclear 2.27-dev
+
 2.1 - 2023.05.13
 * require Dotclear 2.26
 * fix nullsafe warnings
diff --git a/README.md b/README.md
index 5301266..1399af9 100644
--- a/README.md
+++ b/README.md
@@ -3,7 +3,7 @@
 [![Release](https://img.shields.io/github/v/release/JcDenis/arlequin)](https://github.com/JcDenis/arlequin/releases)
 [![Date](https://img.shields.io/github/release-date/JcDenis/arlequin)](https://github.com/JcDenis/arlequin/releases)
 [![Issues](https://img.shields.io/github/issues/JcDenis/arlequin)](https://github.com/JcDenis/arlequin/issues)
-[![Dotclear](https://img.shields.io/badge/dotclear-v2.26-blue.svg)](https://fr.dotclear.org/download)
+[![Dotclear](https://img.shields.io/badge/dotclear-v2.27-blue.svg)](https://fr.dotclear.org/download)
 [![Dotaddict](https://img.shields.io/badge/dotaddict-official-green.svg)](https://plugins.dotaddict.org/dc2/details/arlequin)
 [![License](https://img.shields.io/github/license/JcDenis/arlequin)](https://github.com/JcDenis/arlequin/blob/master/LICENSE)
 
@@ -18,8 +18,9 @@ It allows visitors to select a theme on your blog.
 
  _arlequin_ requires: 
 
-  * content admin permissions to manage theme and public menu
-  * Dotclear 2.26
+ * content admin permissions to manage theme and public menu
+ * Dotclear 2.27
+ * PHP 7.4+
 
 ## USAGE
 
diff --git a/_define.php b/_define.php
index 09f0642..99e2a84 100644
--- a/_define.php
+++ b/_define.php
@@ -10,7 +10,7 @@
  * @copyright Jean-Christian Denis
  * @copyright GPL-2.0 https://www.gnu.org/licenses/gpl-2.0.html
  */
-if (!defined('DC_RC_PATH') || is_null(dcCore::app()->auth)) {
+if (!defined('DC_RC_PATH')) {
     return;
 }
 
@@ -18,9 +18,9 @@ $this->registerModule(
     'Arlequin',
     'Allows visitors choose a theme',
     'Oleksandr Syenchuk, Pierre Van Glabeke and contributors',
-    '2.1',
+    '2.2',
     [
-        'requires'    => [['core', '2.26']],
+        'requires'    => [['core', '2.27']],
         'permissions' => dcCore::app()->auth->makePermissions([
             dcCore::app()->auth::PERMISSION_CONTENT_ADMIN,
         ]),
diff --git a/dcstore.xml b/dcstore.xml
index 8be627f..eef4130 100644
--- a/dcstore.xml
+++ b/dcstore.xml
@@ -2,11 +2,11 @@
 <modules xmlns:da="http://dotaddict.org/da/">
   <module id="arlequin">
     <name>Arlequin</name>
-    <version>2.1</version>
+    <version>2.2</version>
     <author>Oleksandr Syenchuk, Pierre Van Glabeke and contributors</author>
     <desc>Allows visitors choose a theme</desc>
-    <file>https://github.com/JcDenis/arlequin/releases/download/v2.1/plugin-arlequin.zip</file>
-    <da:dcmin>2.26</da:dcmin>
+    <file>https://github.com/JcDenis/arlequin/releases/download/v2.2/plugin-arlequin.zip</file>
+    <da:dcmin>2.27</da:dcmin>
     <da:details>https://plugins.dotaddict.org/dc2/details/arlequin</da:details>
     <da:support>http://forum.dotclear.org/viewtopic.php?id=48345</da:support>
   </module>
diff --git a/src/Backend.php b/src/Backend.php
index 9d57a5d..de1e51a 100644
--- a/src/Backend.php
+++ b/src/Backend.php
@@ -14,61 +14,35 @@ declare(strict_types=1);
 
 namespace Dotclear\Plugin\arlequin;
 
-use dcAdmin;
 use dcCore;
-use dcFavorites;
-use dcNsProcess;
-use dcPage;
+use Dotclear\Core\Process;
+use Dotclear\Core\Backend\{
+    Favorites,
+    Menus
+};
 
-class Backend extends dcNsProcess
+class Backend extends Process
 {
     public static function init(): bool
     {
-        static::$init = defined('DC_CONTEXT_ADMIN')
-            && !is_null(dcCore::app()->auth) && !is_null(dcCore::app()->blog) // nullsafe PHP < 8.0
-            && dcCore::app()->auth->check(dcCore::app()->auth->makePermissions([
-                dcCore::app()->auth::PERMISSION_CONTENT_ADMIN,
-            ]), dcCore::app()->blog->id);
-
-        return static::$init;
+        return self::status(My::checkContext(My::BACKEND));
     }
 
     public static function process(): bool
     {
-        if (!static::$init) {
+        if (!self::status()) {
             return false;
         }
 
-        // nullsafe PHP < 8.0
-        if (is_null(dcCore::app()->auth) || is_null(dcCore::app()->blog) || is_null(dcCore::app()->adminurl)) {
-            return false;
-        }
-
-        dcCore::app()->menu[dcAdmin::MENU_BLOG]->addItem(
-            My::name(),
-            dcCore::app()->adminurl->get('admin.plugin.' . My::id()),
-            [dcPage::getPF(My::id() . '/icon.svg'), dcPage::getPF(My::id() . '/icon-dark.svg')],
-            preg_match(
-                '/' . preg_quote(dcCore::app()->adminurl->get('admin.plugin.' . My::id())) . '(&.*)?$/',
-                $_SERVER['REQUEST_URI']
-            ),
-            dcCore::app()->auth->check(dcCore::app()->auth->makePermissions([
-                dcCore::app()->auth::PERMISSION_CONTENT_ADMIN,
-            ]), dcCore::app()->blog->id)
-        );
+        My::addBackendMenuItem(Menus::MENU_BLOG);
 
         dcCore::app()->addBehaviors([
-            'adminDashboardFavoritesV2' => function (dcFavorites $favs): void {
-                // nullsafe PHP < 8.0
-                if (is_null(dcCore::app()->auth) || is_null(dcCore::app()->adminurl)) {
-                    return;
-                }
-
+            'adminDashboardFavoritesV2' => function (Favorites $favs): void {
                 $favs->register(My::id(), [
                     'title'       => My::name(),
-                    'url'         => dcCore::app()->adminurl->get('admin.plugin.' . My::id()),
-                    'small-icon' => [dcPage::getPF(My::id() . '/icon.svg'), dcPage::getPF(My::id() . '/icon-dark.svg')],
-                    'large-icon' => [dcPage::getPF(My::id() . '/icon.svg'), dcPage::getPF(My::id() . '/icon-dark.svg')],
+                    'url'         => My::manageUrl(),
+                    'small-icon'  => My::icons(),
+                    'large-icon'  => My::icons(),
                     'permissions' => dcCore::app()->auth->makePermissions([
                         dcCore::app()->auth::PERMISSION_CONTENT_ADMIN,
                     ]),
diff --git a/src/Frontend.php b/src/Frontend.php
index acf6c06..d1e5e8a 100644
--- a/src/Frontend.php
+++ b/src/Frontend.php
@@ -15,24 +15,22 @@ declare(strict_types=1);
 namespace Dotclear\Plugin\arlequin;
 
 use dcCore;
-use dcNsProcess;
+use Dotclear\Core\Process;
 use Dotclear\Helper\Network\Http;
 
-class Frontend extends dcNsProcess
+class Frontend extends Process
 {
     public const COOKIE_THEME_PREFIX = 'dc_theme_';
     public const COOKIE_UPDDT_PREFIX = 'dc_user_upddt_';
 
     public static function init(): bool
     {
-        static::$init = defined('DC_RC_PATH');
-
-        return static::$init;
+        return self::status(My::checkContext(My::FRONTEND));
     }
 
     public static function process(): bool
     {
-        if (!static::$init) {
+        if (!self::status()) {
             return false;
         }
 
@@ -62,11 +60,6 @@ class Frontend extends dcNsProcess
 
     protected static function cookieSuffix(): string
     {
-        // nullsafe PHP < 8.0
-        if (is_null(dcCore::app()->blog)) {
-            return '';
-        }
-
         return base_convert(dcCore::app()->blog->uid, 16, 36);
     }
 
@@ -79,13 +72,8 @@ class Frontend extends dcNsProcess
 
     public static function switchTheme(string $theme): void
     {
-        // nullsafe PHP < 8.0
-        if (is_null(dcCore::app()->blog)) {
-            return;
-        }
-
-        if (dcCore::app()->blog->settings->get(My::id())->get('mt_exclude')) {
-            if (in_array($theme, explode('/', dcCore::app()->blog->settings->get(My::id())->get('mt_exclude')))) {
+        if (My::settings()->get('mt_exclude')) {
+            if (in_array($theme, explode('/', My::settings()->get('mt_exclude')))) {
                 return;
             }
         }
diff --git a/src/Manage.php b/src/Manage.php
index ece65fa..c01cb46 100644
--- a/src/Manage.php
+++ b/src/Manage.php
@@ -16,8 +16,11 @@ namespace Dotclear\Plugin\arlequin;
 
 use ArrayObject;
 use dcCore;
-use dcNsProcess;
-use dcPage;
+use Dotclear\Core\Process;
+use Dotclear\Core\Backend\{
+    Notices,
+    Page
+};
 use Dotclear\Helper\Html\Form\{
     Div,
     Form,
@@ -32,32 +35,21 @@ use Dotclear\Helper\Html\Form\{
 use Dotclear\Helper\Html\Html;
 use Exception;
 
-class Manage extends dcNsProcess
+class Manage extends Process
 {
     public static function init(): bool
     {
-        static::$init = defined('DC_CONTEXT_ADMIN')
-            && !is_null(dcCore::app()->auth) && !is_null(dcCore::app()->blog) // nullsafe PHP < 8.0
-            && dcCore::app()->auth->check(dcCore::app()->auth->makePermissions([
-                dcCore::app()->auth::PERMISSION_CONTENT_ADMIN,
-            ]), dcCore::app()->blog->id);
-
-        return static::$init;
+        return self::status(My::checkContext(My::MANAGE));
     }
 
     public static function process(): bool
     {
-        if (!static::$init) {
-            return false;
-        }
-
-        // nullsafe PHP < 8.0
-        if (is_null(dcCore::app()->auth) || is_null(dcCore::app()->blog) || is_null(dcCore::app()->adminurl)) {
+        if (!self::status()) {
             return false;
         }
 
         try {
-            $s = dcCore::app()->blog->settings->get(My::id());
+            $s = My::settings();
 
             $model   = json_decode((string) $s->get('model'), true);
             $exclude = $s->get('exclude');
@@ -69,7 +61,7 @@ class Manage extends dcNsProcess
                 $s->put('model', json_encode($model), 'string', 'Arlequin configuration');
                 $s->put('exclude', 'customCSS', 'string', 'Excluded themes');
 
-                dcPage::AddSuccessNotice(__('Settings have been reinitialized.'));
+                Notices::AddSuccessNotice(__('Settings have been reinitialized.'));
                 dcCore::app()->blog->triggerBlog();
             }
 
@@ -86,9 +78,9 @@ class Manage extends dcNsProcess
                 $s->put('model', json_encode($model));
                 $s->put('exclude', $exclude);
 
-                dcPage::AddSuccessNotice(__('System settings have been updated.'));
+                Notices::AddSuccessNotice(__('System settings have been updated.'));
                 dcCore::app()->blog->triggerBlog();
-                dcCore::app()->adminurl->redirect('admin.plugin.' . My::id(), ['config' => 1]);
+                My::redirect(['config' => 1]);
             }
 
             // restore settings
@@ -96,9 +88,9 @@ class Manage extends dcNsProcess
                 $s->drop('model');
                 $s->drop('exclude');
 
-                dcPage::AddSuccessNotice(__('Settings have been reinitialized.'));
+                Notices::AddSuccessNotice(__('Settings have been reinitialized.'));
                 dcCore::app()->blog->triggerBlog();
-                dcCore::app()->adminurl->redirect('admin.plugin.' . My::id(), ['restore' => 1]);
+                My::redirect(['restore' => 1]);
             }
         } catch (Exception $e) {
             dcCore::app()->error->add($e->getMessage());
@@ -109,12 +101,7 @@ class Manage extends dcNsProcess
 
     public static function render(): void
     {
-        if (!static::$init) {
-            return;
-        }
-
-        // nullsafe PHP < 8.0
-        if (is_null(dcCore::app()->blog) || is_null(dcCore::app()->adminurl)) {
+        if (!self::status()) {
             return;
         }
 
@@ -123,7 +110,7 @@ class Manage extends dcNsProcess
         dcCore::app()->callBehavior('arlequinAddModels', $models);
 
         $models = iterator_to_array($models);
-        $s      = dcCore::app()->blog->settings->get(My::id());
+        $s      = My::settings();
         $model  = json_decode((string) $s->get('model'), true);
         $model  = array_merge(My::defaultModel(), is_array($model) ? $model : []);
         $header = '';
@@ -139,9 +126,9 @@ class Manage extends dcNsProcess
                 ");\n";
         }
 
-        dcPage::openModule(
+        Page::openModule(
             My::name(),
-            dcPage::jsModuleLoad(My::id() . '/js/models.js') . '
+            Page::jsLoad('models') . '
             <script type="text/javascript">
             //<![CDATA[
             arlequin.msg.predefined_models = "' . Html::escapeJS(__('Predefined models')) . '";
@@ -156,13 +143,13 @@ class Manage extends dcNsProcess
         );
 
         echo
-        dcPage::breadcrumb([
+        Page::breadcrumb([
             Html::escapeHTML(dcCore::app()->blog->name) => '',
             My::name()                                  => '',
         ]) .
-        dcPage::notices() .
+        Notices::getNotices() .
 
-        (new Form(My::id() . 'form'))->method('post')->action(dcCore::app()->adminurl->get('admin.plugin.' . My::id()))->fields([
+        (new Form(My::id() . 'form'))->method('post')->action(dcCore::app()->admin->getPageURL())->fields([
             (new Text('h4', __('Switcher display format'))),
             (new Div())->id('models'),
             (new Div())->class('two-boxes odd')->items([
@@ -189,13 +176,13 @@ class Manage extends dcNsProcess
                 (new Note())->class('form-note')->text('Semicolon separated list of themes IDs (theme folder name). Ex: ductile;berlin'),
             ]),
             (new Para())->separator(' ')->items([
-                dcCore::app()->formNonce(false),
                 (new Submit(['mt_action_config']))->value(__('Save')),
                 (new Submit(['mt_action_restore']))->value(__('Restore defaults')),
+                ... My::hiddenFields(),
             ]),
         ])->render();
 
-        dcPage::helpBlock('arlequin');
-        dcPage::closeModule();
+        Page::helpBlock('arlequin');
+        Page::closeModule();
     }
 }
diff --git a/src/My.php b/src/My.php
index 2b46812..ab716cc 100644
--- a/src/My.php
+++ b/src/My.php
@@ -15,36 +15,20 @@ declare(strict_types=1);
 namespace Dotclear\Plugin\arlequin;
 
 use dcCore;
+use Dotclear\Module\MyPlugin;
 
 /**
  * This module definitions.
  */
-class My
+class My extends MyPlugin
 {
-    /**
-     * This module id.
-     */
-    public static function id(): string
+    public static function checkCustomContext(int $context): ?bool
     {
-        return basename(dirname(__DIR__));
-    }
-
-    /**
-     * This module name.
-     */
-    public static function name(): string
-    {
-        $name = dcCore::app()->plugins->moduleInfo(self::id(), 'name');
-
-        return __(is_string($name) ? $name : self::id());
-    }
-
-    /**
-     * This module path.
-     */
-    public static function path(): string
-    {
-        return dirname(__DIR__);
+        return !in_array($context, [My::BACKEND, My::MANAGE, My::MENU]) ? null :
+            defined('DC_CONTEXT_ADMIN')
+            && dcCore::app()->auth->check(dcCore::app()->auth->makePermissions([
+                dcCore::app()->auth::PERMISSION_CONTENT_ADMIN,
+            ]), dcCore::app()->blog->id);
     }
 
     /**
diff --git a/src/Uninstall.php b/src/Uninstall.php
index eb81039..4b09363 100644
--- a/src/Uninstall.php
+++ b/src/Uninstall.php
@@ -15,21 +15,19 @@ declare(strict_types=1);
 namespace Dotclear\Plugin\arlequin;
 
 use dcCore;
-use dcNsProcess;
+use Dotclear\Core\Process;
 use Dotclear\Plugin\Uninstaller\Uninstaller;
 
-class Uninstall extends dcNsProcess
+class Uninstall extends Process
 {
     public static function init(): bool
     {
-        static::$init = defined('DC_CONTEXT_ADMIN');
-
-        return static::$init;
+        return self::status(My::checkContext(My::UNINSTALL));
     }
 
     public static function process(): bool
     {
-        if (!static::$init || !dcCore::app()->plugins->moduleExists('Uninstaller')) {
+        if (!self::status() || !dcCore::app()->plugins->moduleExists('Uninstaller')) {
             return false;
         }
 
diff --git a/src/Widgets.php b/src/Widgets.php
index 80eae8a..6207689 100644
--- a/src/Widgets.php
+++ b/src/Widgets.php
@@ -45,13 +45,8 @@ class Widgets
             return '';
         }
 
-        // nullsafe PHP < 8.0
-        if (is_null(dcCore::app()->blog)) {
-            return '';
-        }
-
-        $model   = json_decode((string) dcCore::app()->blog->settings->get(My::id())->get('model'), true);
-        $exclude = explode(';', (string) dcCore::app()->blog->settings->get(My::id())->get('exclude'));
+        $model   = json_decode((string) My::settings()->get('model'), true);
+        $exclude = explode(';', (string) My::settings()->get('exclude'));
         $modules = array_diff_key(dcCore::app()->themes->getDefines(['state' => dcModuleDefine::STATE_ENABLED], true), array_flip($exclude));
         if (!is_array($model) || empty($modules)) {
             return '';