diff --git a/demos/interactive/accordion-nested.php b/demos/interactive/accordion-nested.php
index 50e44ee539..2ac01dc94c 100644
--- a/demos/interactive/accordion-nested.php
+++ b/demos/interactive/accordion-nested.php
@@ -5,25 +5,17 @@
 namespace Atk4\Ui\Demos;
 
 use Atk4\Ui\Accordion;
-use Atk4\Ui\Button;
 use Atk4\Ui\Form;
 use Atk4\Ui\Header;
 use Atk4\Ui\LoremIpsum;
 use Atk4\Ui\Message;
-use Atk4\Ui\View;
 
 /** @var \Atk4\Ui\App $app */
 require_once __DIR__ . '/../init-app.php';
 
-/*
-Button::addTo($app, ['View Form input split in Accordion section', 'class.small right floated basic blue' => true, 'iconRight' => 'right arrow'])
-    ->link(['accordion-in-form']);
-View::addTo($app, ['ui' => 'clearing divider']);
-*/
-
 Header::addTo($app, ['Nested accordions']);
 
-$addAccordionFunc = function ($view, $maxDepth = 2, $level = 0) use (&$addAccordionFunc) {
+$addAccordionFunc = function ($view, $maxDepth, $level = 0) use (&$addAccordionFunc) {
     $accordion = Accordion::addTo($view, ['type' => ['styled', 'fluid']]);
 
     // static section
@@ -38,27 +30,24 @@
     $i2 = $accordion->addSection('Dynamic Text', function ($v) use ($addAccordionFunc, $maxDepth, $level) {
         Message::addTo($v, ['Every time you open this accordion item, you will see a different text', 'ui' => 'tiny message']);
         LoremIpsum::addTo($v, ['size' => 2]);
-        if ($level < $maxDepth) {
-            $addAccordionFunc($v, $maxDepth, $level + 1);
-        }
+
+        $addAccordionFunc($v, $maxDepth, $level + 1);
     });
 
     // dynamic section - form view
     $i3 = $accordion->addSection('Dynamic Form', function ($v) use ($addAccordionFunc, $maxDepth, $level) {
         Message::addTo($v, ['Loading a form dynamically.', 'ui' => 'tiny message']);
         $form = Form::addTo($v);
-        $form->addControl('Email');
+        $form->addControl('email');
         $form->onSubmit(function (Form $form) {
-            return $form->success('Subscribed ' . $form->model->get('Email') . ' to newsletter.');
+            return $form->success('Subscribed ' . $form->model->get('email') . ' to newsletter.');
         });
 
-        if ($level < $maxDepth) {
-            $addAccordionFunc($v, $maxDepth, $level + 1);
-        }
+        $addAccordionFunc($v, $maxDepth, $level + 1);
     });
 
     return $accordion;
 };
 
 // add accordion structure
-$addAccordionFunc($app);
+$addAccordionFunc($app, 4);
diff --git a/phpstan.neon.dist b/phpstan.neon.dist
index 20e7b22418..1f30f145d6 100644
--- a/phpstan.neon.dist
+++ b/phpstan.neon.dist
@@ -159,9 +159,6 @@ parameters:
         -
             path: 'src/Form/Control/Checkbox.php'
             message: '~^Access to an undefined property Atk4\\Ui\\Jquery::\$checked\.$~'
-        -
-            path: 'src/Form/Layout/Section/Accordion.php'
-            message: '~^Call to an undefined method Atk4\\Ui\\View::jsOpen\(\)\.$~'
         -
             path: 'src/JsVueService.php'
             message: '~^Call to an undefined method Atk4\\Ui\\JsChain::createAtkVue\(\)\.$~'
diff --git a/public/agileui.less b/public/agileui.less
index 2c1bc721b9..eac004df22 100644
--- a/public/agileui.less
+++ b/public/agileui.less
@@ -43,7 +43,7 @@
 @tabletWidth: 768px;
 @adminMenuHeight: 48px;
 @atkFooterHeight : 50px;
-@menuBorder: 1px solid rgba(255,255,255,0.10);
+@menuBorder: 1px solid rgba(255,255,255,0.1);
 
 @atkSlidePanelColor: @offWhite;
 
diff --git a/src/Accordion.php b/src/Accordion.php
index df7be92d75..71c97fa4f4 100644
--- a/src/Accordion.php
+++ b/src/Accordion.php
@@ -45,7 +45,6 @@ public function addSection($title, \Closure $callback = null, $icon = 'dropdown'
         // if there is callback action, then use VirtualPage
         if ($callback) {
             $section->virtualPage = VirtualPage::addTo($section, ['ui' => '']);
-            $section->virtualPage->stickyGet('__atk-dyn-section', '1');
             $section->virtualPage->set($callback);
         }
 
@@ -152,22 +151,15 @@ public function getSectionIdx(AccordionSection $section)
         return $idx;
     }
 
-    /**
-     * Check if accordion section is dynamic.
-     */
-    public function isDynamicSection(): bool
-    {
-        return isset($_GET['__atk-dyn-section']);
-    }
-
     protected function renderView(): void
     {
         if ($this->type) {
             $this->addClass($this->type);
         }
 
-        // Only set Accordion in Top container. Otherwise Nested accordion won't work.
-        if (!$this->getClosestOwner($this, AccordionSection::class) && !$this->isDynamicSection()) {
+        // initialize top accordion only, otherwise nested accordion won't work
+        // https://github.com/fomantic/Fomantic-UI/issues/254
+        if ($this->getClosestOwner(AccordionSection::class) === null) {
             $this->js(true)->accordion($this->settings);
         }
 
diff --git a/src/Form/Control.php b/src/Form/Control.php
index 91b7a6655d..62b0a7a4c0 100644
--- a/src/Form/Control.php
+++ b/src/Form/Control.php
@@ -125,8 +125,7 @@ protected function renderTemplateToHtml(string $region = null): string
     {
         $output = parent::renderTemplateToHtml($region);
 
-        /** @var Form|null $form */
-        $form = $this->getClosestOwner($this, Form::class);
+        $form = $this->getClosestOwner(Form::class);
 
         return $form !== null ? $form->fixOwningFormAttrInRenderedHtml($output) : $output;
     }
diff --git a/src/Form/Layout/Section/Accordion.php b/src/Form/Layout/Section/Accordion.php
index b71abfbe83..38e24e4015 100644
--- a/src/Form/Layout/Section/Accordion.php
+++ b/src/Form/Layout/Section/Accordion.php
@@ -30,7 +30,7 @@ protected function init(): void
             $jsError = [$form->js()->form('add prompt', $fieldName, $str)];
 
             // if a form control is part of an accordion section, it will open that section.
-            $section = $form->getClosestOwner($form->getControl($fieldName), AccordionSection::class);
+            $section = $form->getControl($fieldName)->getClosestOwner(AccordionSection::class);
             if ($section) {
                 $jsError[] = $section->getOwner()->jsOpen($section);
             }
diff --git a/src/Popup.php b/src/Popup.php
index 187e0790f4..fd8c0e8437 100644
--- a/src/Popup.php
+++ b/src/Popup.php
@@ -107,17 +107,15 @@ protected function init(): void
                 ->addMoreInfo('owner', $this->getOwner());
         }
 
-        if (($this->triggerBy instanceof Menu
-            || $this->triggerBy instanceof MenuItem
-            || $this->triggerBy instanceof Dropdown) && $this->triggerOn === null
-        ) {
-            $this->triggerOn = 'hover';
-        }
-
-        if (
-            $this->triggerBy instanceof Button && $this->triggerOn === null
-        ) {
-            $this->triggerOn = 'click';
+        if ($this->triggerOn === null) {
+            if ($this->triggerBy instanceof Menu
+                || $this->triggerBy instanceof MenuItem
+                || $this->triggerBy instanceof Dropdown
+            ) {
+                $this->triggerOn = 'hover';
+            } elseif ($this->triggerBy instanceof Button) {
+                $this->triggerOn = 'click';
+            }
         }
 
         $this->popOptions = array_merge($this->popOptions, [
diff --git a/src/View.php b/src/View.php
index 38f7f4cb33..85a0fd6509 100644
--- a/src/View.php
+++ b/src/View.php
@@ -297,24 +297,25 @@ public function add($object, $region = null): AbstractView
     }
 
     /**
-     * Get objects closest owner which is instance of particular class.
+     * Get closest owner which is instance of particular class.
      *
-     * If there are no such owner (or grand-owner etc.) object, then return.
+     * @template T of View
      *
-     * Note: this is internal method, but should be public because other objects
-     *       should be able to call it.
+     * @param class-string<T> $class
+     *
+     * @phpstan-return T|null
      */
-    public function getClosestOwner(self $object, string $class): ?self
+    public function getClosestOwner(string $class): ?self
     {
-        if ($object->issetOwner()) {
+        if (!$this->issetOwner()) {
             return null;
         }
 
-        if ($object->getOwner() instanceof $class) {
-            return $object->getOwner();
+        if ($this->getOwner() instanceof $class) {
+            return $this->getOwner();
         }
 
-        return $this->getClosestOwner($object->getOwner(), $class);
+        return $this->getOwner()->getClosestOwner($class);
     }
 
     // }}}
diff --git a/tests-behat/accordion.feature b/tests-behat/accordion.feature
index 21d836cfa6..c1c3268180 100644
--- a/tests-behat/accordion.feature
+++ b/tests-behat/accordion.feature
@@ -4,3 +4,19 @@ Feature: Accordion
     Given I am on "form/form-section-accordion.php"
     Then I should see "Email"
     Then I fill in "email" with "xxx@xxx.com"
+
+  Scenario: Nested Accordion
+    Given I am on "interactive/accordion-nested.php"
+    Then I click using selector "xpath((//div[text()='Static Text'])[1])"
+    Then I click using selector "xpath((//div[text()='Static Text'])[1])"
+    Then I click using selector "xpath((//div[text()='Static Text'])[1])"
+    Then I click using selector "xpath((//div[text()='Static Text'])[2])"
+    Then I click using selector "xpath((//div[text()='Dynamic Text'])[3])"
+    Then I click using selector "xpath((//div[text()='Dynamic Text'])[3])"
+    Then I click using selector "xpath((//div[text()='Dynamic Text'])[3])"
+    Then I click using selector "xpath((//div[text()='Dynamic Form'])[4])"
+    Then I click using selector "xpath((//div[text()='Dynamic Form'])[4])"
+    Then I click using selector "xpath((//div[text()='Dynamic Form'])[4])"
+    Then I fill in "email" with "xxx@xxx.com"
+    When I press button "Save"
+    Then I should see "Subscribed xxx@xxx.com to newsletter."