diff --git a/composer.json b/composer.json
index b380a304d8..dfb75326fe 100644
--- a/composer.json
+++ b/composer.json
@@ -60,7 +60,9 @@
     },
     "require-release": {
         "php": ">=7.4 <8.2",
-        "atk4/data": "~4.0.0"
+        "atk4/data": "~4.0.0",
+        "symfony/filesystem": "^4.4 || ^5.3",
+        "symfony/http-foundation": "^4.4 || ^5.3"
     },
     "require-dev": {
         "behat/mink-extension": "^2.3.1",
diff --git a/demos/_includes/DemoLookup.php b/demos/_includes/DemoLookup.php
index 443427b767..b707f8f147 100644
--- a/demos/_includes/DemoLookup.php
+++ b/demos/_includes/DemoLookup.php
@@ -43,7 +43,6 @@ protected function initQuickNewRecord()
             $form = \Atk4\Ui\Form::addTo($page);
 
             $entity = $this->model->createEntity();
-
             $form->setModel($entity, $this->plus['fields'] ?? null);
 
             $form->onSubmit(function (\Atk4\Ui\Form $form) {
diff --git a/demos/_unit-test/callback.php b/demos/_unit-test/callback.php
index 455a945b84..e077fe1b91 100644
--- a/demos/_unit-test/callback.php
+++ b/demos/_unit-test/callback.php
@@ -18,7 +18,7 @@
 $vp->cb->triggerOnReload = false;
 
 $form = Form::addTo($vp);
-$form->setModel($m->tryLoadAny(), [$m->fieldName()->name]);
+$form->setModel($m->loadAny(), [$m->fieldName()->name]);
 $form->getControl($m->fieldName()->name)->caption = 'TestName';
 
 $table = \Atk4\Ui\Table::addTo($app);
diff --git a/demos/collection/crud.php b/demos/collection/crud.php
index b1ec5bea65..7623c6eda9 100644
--- a/demos/collection/crud.php
+++ b/demos/collection/crud.php
@@ -4,7 +4,6 @@
 
 namespace Atk4\Ui\Demos;
 
-use Atk4\Data\Model;
 use Atk4\Ui\Form;
 
 /** @var \Atk4\Ui\App $app */
diff --git a/demos/data-action/jsactions2.php b/demos/data-action/jsactions2.php
index 37e9ce06e0..3da9cee39d 100644
--- a/demos/data-action/jsactions2.php
+++ b/demos/data-action/jsactions2.php
@@ -12,7 +12,7 @@
 require_once __DIR__ . '/../init-app.php';
 
 $country = new Country($app->db);
-$entity = $country->tryLoadAny();
+$entity = $country->loadAny();
 $countryId = $entity->getId();
 
 // Model actions for this file are setup in DemoActionUtil.
diff --git a/demos/form-control/lookup.php b/demos/form-control/lookup.php
index f39c530f40..a3719cc78c 100644
--- a/demos/form-control/lookup.php
+++ b/demos/form-control/lookup.php
@@ -44,7 +44,8 @@
         . '; '
         . $form->model->ref('country2')->get(Country::hinting()->fieldName()->name)
         . '; '
-        . (new Country($form->getApp()->db))->tryLoad($form->model->get('country3'))->get(Country::hinting()->fieldName()->name);
+        . (new Country($form->getApp()->db))->load($form->model->get('country3'))
+            ->get(Country::hinting()->fieldName()->name);
 
     $view = new \Atk4\Ui\Message('Select:'); // need in behat test.
     $view->invokeInit();
diff --git a/demos/form/form3.php b/demos/form/form3.php
index d1339bdba8..f912847786 100644
--- a/demos/form/form3.php
+++ b/demos/form/form3.php
@@ -27,13 +27,8 @@
     ->on('click', new JsReload($seg, ['m' => 'stat']));
 
 $form = Form::addTo($seg, ['layout' => [Form\Layout\Columns::class]]);
-$form->setModel((
-    isset($_GET['m']) ? (
-        $_GET['m'] === 'country' ? new Country($app->db) : (
-            $_GET['m'] === 'file' ? new File($app->db) : new Stat($app->db)
-        )
-    ) : new Stat($app->db)
-)->tryLoadAny());
+$modelClass = ['country' => Country::class, 'file' => File::class][$_GET['m'] ?? ''] ?? Stat::class;
+$form->setModel((new $modelClass($app->db))->loadAny());
 
 $form->onSubmit(function (Form $form) {
     $errors = [];
diff --git a/demos/interactive/card.php b/demos/interactive/card.php
index 4d6f0b642d..ce7098184d 100644
--- a/demos/interactive/card.php
+++ b/demos/interactive/card.php
@@ -48,16 +48,14 @@
 
 $cardStat = \Atk4\Ui\Card::addTo($deck, ['useTable' => true]);
 $cardStat->addContent(new \Atk4\Ui\Header(['Project Info']));
-$stat = (new Stat($app->db))->tryLoadAny();
-
+$stat = (new Stat($app->db))->loadAny();
 $cardStat->setModel($stat, [$stat->fieldName()->project_name, $stat->fieldName()->project_code, $stat->fieldName()->client_name, $stat->fieldName()->start_date]);
 
 $btn = $cardStat->addButton(new \Atk4\Ui\Button(['Email Client']));
 
 $cardStat = \Atk4\Ui\Card::addTo($deck, ['useLabel' => true]);
 $cardStat->addContent(new \Atk4\Ui\Header(['Project Info']));
-$stat = (new Stat($app->db))->tryLoadAny();
-
+$stat = (new Stat($app->db))->loadAny();
 $cardStat->setModel($stat, [$stat->fieldName()->project_name, $stat->fieldName()->project_code, $stat->fieldName()->client_name, $stat->fieldName()->start_date]);
 
 $cardStat->addButton(new \Atk4\Ui\Button(['Email Client']));
diff --git a/demos/interactive/cardtable.php b/demos/interactive/cardtable.php
index 1c817ab11a..452e00970c 100644
--- a/demos/interactive/cardtable.php
+++ b/demos/interactive/cardtable.php
@@ -9,4 +9,4 @@
 
 \Atk4\Ui\Header::addTo($app, ['Card displays read-only data of a single record']);
 
-\Atk4\Ui\CardTable::addTo($app)->setModel((new Stat($app->db))->tryLoadAny());
+\Atk4\Ui\CardTable::addTo($app)->setModel((new Stat($app->db))->loadAny());
diff --git a/demos/interactive/console.php b/demos/interactive/console.php
index 175a15cbe3..371fd5da50 100644
--- a/demos/interactive/console.php
+++ b/demos/interactive/console.php
@@ -112,7 +112,7 @@ public function generateReport()
 
     $console = \Atk4\Ui\Console::addTo($tab, ['event' => false]);
     $console->set(function ($console) {
-        $model = $_SESSION['data'];
+        $model = $_SESSION['atk4_ui_console_demo'];
         $console->output('Executing process...');
         $console->info(var_export($model->get(), true));
         sleep(1);
@@ -123,7 +123,7 @@ public function generateReport()
     $console->js(true)->hide();
 
     $form->onSubmit(function (\Atk4\Ui\Form $form) use ($console) {
-        $_SESSION['data'] = $form->model; // only option is to store model in session here in demo
+        $_SESSION['atk4_ui_console_demo'] = $form->model; // only option is to store model in session here in demo
 
         return [
             $console->js()->show(),
diff --git a/demos/others/sticky2.php b/demos/others/sticky2.php
index 2025ebc5a8..cb5ecdfebb 100644
--- a/demos/others/sticky2.php
+++ b/demos/others/sticky2.php
@@ -16,7 +16,7 @@
     $frame->stickyGet('name');
 
     // frame will generate URL with sticky parameter
-    \Atk4\Ui\Label::addTo($frame, ['Name:', 'detail' => $_GET['name'], 'black'])->link($frame->url());
+    \Atk4\Ui\Label::addTo($frame, ['Name:', 'detail' => $_GET['name'], 'class.black' => true])->link($frame->url());
 
     // app still generates URL without localized sticky
     \Atk4\Ui\Label::addTo($frame, ['Reset', 'iconRight' => 'close', 'class.black' => true])->link($app->url());
diff --git a/demos/tutorial/actions.php b/demos/tutorial/actions.php
index 93851980e9..0d347696fb 100644
--- a/demos/tutorial/actions.php
+++ b/demos/tutorial/actions.php
@@ -62,14 +62,14 @@
     Demo::addTo($page)->setCodeAndCall(function (View $owner) {
         $country = new Country($owner->getApp()->db);
 
-        $country->addUserAction('send_message', function () {
-            return 'sent';
+        $country->addUserAction('send_message', function (Country $entity) {
+            return 'sent to ' . $entity->get($entity->fieldName()->name);
         });
-        $country = $country->tryLoadAny();
+        $country = $country->loadAny();
 
         $card = \Atk4\Ui\Card::addTo($owner);
         $card->setModel($country, [$country->fieldName()->iso]);
-        $card->addClickAction($country->getUserAction('send_message'));
+        $card->addClickAction($country->getModel()->getUserAction('send_message'));
     });
 });
 
diff --git a/demos/tutorial/intro.php b/demos/tutorial/intro.php
index 0f9372a758..a57815b264 100644
--- a/demos/tutorial/intro.php
+++ b/demos/tutorial/intro.php
@@ -141,25 +141,26 @@ protected function init(): void
         */
         session_start();
 
-        $model = new DemoInvoice(new Persistence\Array_($_SESSION['x'] ?? []), ['dateFormat' => $owner->getApp()->uiPersistence->dateFormat]);
+        $model = new DemoInvoice(new Persistence\Array_($_SESSION['atk4_ui_intro_demo'] ?? []), ['dateFormat' => $owner->getApp()->uiPersistence->dateFormat]);
         $model->onHook(\Atk4\Data\Model::HOOK_AFTER_SAVE, function (Model $model) {
-            $_SESSION['x'][$model->getId()] = $model->get();
+            $_SESSION['atk4_ui_intro_demo'][$model->getId()] = (clone $model->getModel())->addCondition($model->idField, $model->getId())->export(null, null, false)[$model->getId()];
         });
 
         Header::addTo($owner, ['Set invoice data:']);
         $form = \Atk4\Ui\Form::addTo($owner);
-        $model = $model->tryLoad(1);
-        $form->setModel($model);
 
-        if (!$model->isLoaded()) {
+        $entity = $model->tryLoad(1);
+        if ($entity === null) {
             // set default data
-            $model->setMulti([
+            $entity = $model->createEntity();
+            $entity->setMulti([
                 'id' => 1,
                 'reference' => 'Inv-' . random_int(1000, 9999),
                 'date' => new \DateTime(),
             ]);
-            $model->save();
+            $entity->save();
         }
+        $form->setModel($entity);
 
         $form->onSubmit(function (Form $form) {
             $form->model->save();
@@ -203,14 +204,14 @@ protected function init(): void
     Demo::addTo($page)->setCodeAndCall(function (View $owner) {
         session_start();
 
-        $model = new DemoInvoice(new Persistence\Array_($_SESSION['x'] ?? []), ['dateFormat' => $owner->getApp()->uiPersistence->dateFormat]);
+        $model = new DemoInvoice(new Persistence\Array_($_SESSION['atk4_ui_intro_demo'] ?? []), ['dateFormat' => $owner->getApp()->uiPersistence->dateFormat]);
         $model->onHook(\Atk4\Data\Model::HOOK_AFTER_SAVE, function (Model $model) {
-            $_SESSION['x'][$model->getId()] = $model->get();
+            $_SESSION['atk4_ui_intro_demo'][$model->getId()] = (clone $model->getModel())->addCondition($model->idField, $model->getId())->export(null, null, false)[$model->getId()];
         });
 
         Header::addTo($owner, ['Record display in Card View using model data.']);
         $model = $model->tryLoad(1);
-        if ($model->isLoaded()) {
+        if ($model !== null) {
             \Atk4\Ui\Card::addTo($owner, ['useLabel' => true])
                 ->setModel($model);
         } else {
@@ -230,5 +231,5 @@ protected function init(): void
 $wizard->addFinish(function ($page) use ($wizard) {
     PromotionText::addTo($page);
     \Atk4\Ui\Button::addTo($wizard, ['Exit demo', 'class.primary' => true, 'icon' => 'left arrow'], ['Left'])
-        ->link('/demos/index.php');
+        ->link('../');
 });
diff --git a/docs/app.rst b/docs/app.rst
index 3093f12ec2..270d60fa49 100644
--- a/docs/app.rst
+++ b/docs/app.rst
@@ -74,8 +74,6 @@ active. (See :ref:`system_pattern`)::
             $this->db->setApp($this);
 
             // My App class provides access to a currently logged user and currently selected system.
-            $this->user = new User($this->db);
-            $this->company = new Company($this->db);
             session_start();
 
             // App class may be used for pages that do not require authentication
@@ -85,13 +83,14 @@ active. (See :ref:`system_pattern`)::
                 return;
             }
 
-            // Load User from database based on session data
+            // Load user from database based on session data
             if (isset($_SESSION['user_id'])) {
-                $this->user = $this->user->tryLoad($_SESSION['user_id']);
+                $user = new User($this->db);
+                $this->user = $user->tryLoad($_SESSION['user_id']);
             }
 
             // Make sure user is valid
-            if (!$this->user->isLoaded()) {
+            if ($this->user === null) {
                 $this->initLayout([\Atk4\Ui\Layout\Centered::class]);
                 Message::addTo($this, ['Login Required', 'type' => 'error']);
                 Button::addTo($this, ['Login', 'class.primary' => true])->link('index.php');
diff --git a/src/App.php b/src/App.php
index b62ba21592..979d011671 100644
--- a/src/App.php
+++ b/src/App.php
@@ -604,9 +604,10 @@ public function loadTemplate($filename)
             return $template->loadFromFile($filename);
         }
 
-        $dir = is_array($this->templateDir) ? $this->templateDir : [$this->templateDir];
-        foreach ($dir as $td) {
-            if ($t = $template->tryLoadFromFile($td . '/' . $filename)) {
+        $dirs = is_array($this->templateDir) ? $this->templateDir : [$this->templateDir];
+        foreach ($dirs as $dir) {
+            $t = $template->tryLoadFromFile($dir . '/' . $filename);
+            if ($t !== false) {
                 return $t;
             }
         }
diff --git a/src/Form/Control/DropdownCascade.php b/src/Form/Control/DropdownCascade.php
index 1e6ea73472..4ac5934442 100644
--- a/src/Form/Control/DropdownCascade.php
+++ b/src/Form/Control/DropdownCascade.php
@@ -79,7 +79,7 @@ public function getNewValues($id): array
             return [['value' => '', 'text' => $this->empty, 'name' => $this->empty]];
         }
 
-        $model = $this->cascadeFrom->model->tryLoad($id)->ref($this->reference);
+        $model = $this->cascadeFrom->model->load($id)->ref($this->reference);
         $values = [];
         foreach ($model as $k => $row) {
             if ($this->renderRowFunction) {
diff --git a/src/Form/Control/Lookup.php b/src/Form/Control/Lookup.php
index c19ee66269..a6bc3b3119 100644
--- a/src/Form/Control/Lookup.php
+++ b/src/Form/Control/Lookup.php
@@ -414,15 +414,10 @@ protected function renderView(): void
         if ($this->entityField && $this->entityField->get()) {
             $idField = $this->idField ?: $this->model->idField;
 
-            $this->model = $this->model->tryLoadBy($idField, $this->entityField->get());
+            $this->model = $this->model->loadBy($idField, $this->entityField->get());
 
-            if ($this->model->isLoaded()) {
-                $row = $this->renderRow($this->model);
-
-                $chain->dropdown('set value', $row['value'])->dropdown('set text', $row['title']);
-            } else {
-                $this->entityField->setNull();
-            }
+            $row = $this->renderRow($this->model);
+            $chain->dropdown('set value', $row['value'])->dropdown('set text', $row['title']);
         }
 
         $this->js(true, $chain);
diff --git a/src/Form/Control/Multiline.php b/src/Form/Control/Multiline.php
index 3606e00165..32b95019ea 100644
--- a/src/Form/Control/Multiline.php
+++ b/src/Form/Control/Multiline.php
@@ -344,7 +344,7 @@ public function saveRows(): self
         $currentIds = array_column($model->export(), $model->idField);
 
         foreach ($this->rowData as $row) {
-            $entity = $model->tryLoad($row[$model->idField] ?? null);
+            $entity = $row[$model->idField] !== null ? $model->load($row[$model->idField]) : $model->createEntity();
             foreach ($row as $fieldName => $value) {
                 if ($fieldName === '__atkml') {
                     continue;
@@ -568,11 +568,11 @@ protected function getLookupProps(Field $field): array
     public function setLookupOptionValue(Field $field, string $value)
     {
         $model = $field->getReference()->refModel($this->model);
-        $rec = $model->tryLoadBy($field->getReference()->getTheirFieldName(), $value);
-        if ($rec->isLoaded()) {
+        $entity = $model->tryLoadBy($field->getReference()->getTheirFieldName(), $value);
+        if ($entity !== null) {
             $option = [
                 'key' => $value,
-                'text' => $rec->get($model->titleField),
+                'text' => $entity->get($model->titleField),
                 'value' => $value,
             ];
             foreach ($this->fieldDefs as $key => $component) {
@@ -787,7 +787,7 @@ private function getExpressionValues(Model $model): array
             foreach ($dummyFields as $field) {
                 $dummyModel->addExpression($field['name'], ['expr' => $field['expr'], 'type' => $model->getField($field['name'])->type]);
             }
-            $values = $dummyModel->tryLoadAny()->get();
+            $values = $dummyModel->loadAny()->get();
             unset($values[$model->idField]);
 
             foreach ($values as $f => $value) {
diff --git a/src/Form/Control/ScopeBuilder.php b/src/Form/Control/ScopeBuilder.php
index ec1caa1282..c07453e004 100644
--- a/src/Form/Control/ScopeBuilder.php
+++ b/src/Form/Control/ScopeBuilder.php
@@ -715,11 +715,11 @@ protected static function getOption(string $type, string $value, Condition $cond
                 $reference = $condField->getReference();
                 $model = $reference->refModel($condField->getOwner());
                 $fieldName = $reference->getTheirFieldName();
-                $rec = $model->tryLoadBy($fieldName, $value);
-                if ($rec->isLoaded()) {
+                $entity = $model->tryLoadBy($fieldName, $value);
+                if ($entity !== null) {
                     $option = [
                         'key' => $value,
-                        'text' => $rec->get($model->titleField),
+                        'text' => $entity->get($model->titleField),
                         'value' => $value,
                     ];
                 }
diff --git a/src/UserAction/ConfirmationExecutor.php b/src/UserAction/ConfirmationExecutor.php
index 9c11c4011d..4ab3190070 100644
--- a/src/UserAction/ConfirmationExecutor.php
+++ b/src/UserAction/ConfirmationExecutor.php
@@ -117,9 +117,10 @@ public function executeModelAction()
     {
         $id = $this->stickyGet($this->name);
         if ($id && $this->action->appliesTo === Model\UserAction::APPLIES_TO_SINGLE_RECORD) {
-            $this->action = $this->action->getActionForEntity($this->action->getModel()->tryLoad($id));
+            $this->action = $this->action->getActionForEntity($this->action->getModel()->load($id));
         } elseif (!$this->action->isOwnerEntity()
-                && in_array($this->action->appliesTo, [Model\UserAction::APPLIES_TO_NO_RECORDS, Model\UserAction::APPLIES_TO_SINGLE_RECORD], true)) {
+            && in_array($this->action->appliesTo, [Model\UserAction::APPLIES_TO_NO_RECORDS, Model\UserAction::APPLIES_TO_SINGLE_RECORD], true)
+        ) {
             $this->action = $this->action->getActionForEntity($this->action->getModel()->createEntity());
         }
 
diff --git a/src/UserAction/JsCallbackExecutor.php b/src/UserAction/JsCallbackExecutor.php
index e42555adce..ee23340479 100644
--- a/src/UserAction/JsCallbackExecutor.php
+++ b/src/UserAction/JsCallbackExecutor.php
@@ -62,9 +62,10 @@ public function executeModelAction(array $args = [])
             // may be id is passed as 'id' or model->idField within $post args.
             $id = $_POST['c0'] ?? $_POST['id'] ?? $_POST[$this->action->getModel()->idField] ?? null;
             if ($id && $this->action->appliesTo === Model\UserAction::APPLIES_TO_SINGLE_RECORD) {
-                $this->action = $this->action->getActionForEntity($this->action->getModel()->tryLoad($id));
+                $this->action = $this->action->getActionForEntity($this->action->getModel()->load($id));
             } elseif (!$this->action->isOwnerEntity()
-                    && in_array($this->action->appliesTo, [Model\UserAction::APPLIES_TO_NO_RECORDS, Model\UserAction::APPLIES_TO_SINGLE_RECORD], true)) {
+                && in_array($this->action->appliesTo, [Model\UserAction::APPLIES_TO_NO_RECORDS, Model\UserAction::APPLIES_TO_SINGLE_RECORD], true)
+            ) {
                 $this->action = $this->action->getActionForEntity($this->action->getModel()->createEntity());
             }
 
diff --git a/src/UserAction/ModalExecutor.php b/src/UserAction/ModalExecutor.php
index 4d583a41a1..17fdef2c5d 100644
--- a/src/UserAction/ModalExecutor.php
+++ b/src/UserAction/ModalExecutor.php
@@ -97,9 +97,10 @@ public function executeModelAction(): void
     {
         $id = $this->stickyGet($this->name);
         if ($id && $this->action->appliesTo === Model\UserAction::APPLIES_TO_SINGLE_RECORD) {
-            $this->action = $this->action->getActionForEntity($this->action->getModel()->tryLoad($id));
+            $this->action = $this->action->getActionForEntity($this->action->getModel()->load($id));
         } elseif (!$this->action->isOwnerEntity()
-                && in_array($this->action->appliesTo, [Model\UserAction::APPLIES_TO_NO_RECORDS, Model\UserAction::APPLIES_TO_SINGLE_RECORD], true)) {
+            && in_array($this->action->appliesTo, [Model\UserAction::APPLIES_TO_NO_RECORDS, Model\UserAction::APPLIES_TO_SINGLE_RECORD], true)
+        ) {
             $this->action = $this->action->getActionForEntity($this->action->getModel()->createEntity());
         }
 
diff --git a/src/UserAction/PanelExecutor.php b/src/UserAction/PanelExecutor.php
index 3176dd05a5..410f30857d 100644
--- a/src/UserAction/PanelExecutor.php
+++ b/src/UserAction/PanelExecutor.php
@@ -104,9 +104,10 @@ public function executeModelAction(): void
     {
         $id = $this->stickyGet($this->name);
         if ($id && $this->action->appliesTo === Model\UserAction::APPLIES_TO_SINGLE_RECORD) {
-            $this->action = $this->action->getActionForEntity($this->action->getModel()->tryLoad($id));
+            $this->action = $this->action->getActionForEntity($this->action->getModel()->load($id));
         } elseif (!$this->action->isOwnerEntity()
-                && in_array($this->action->appliesTo, [Model\UserAction::APPLIES_TO_NO_RECORDS, Model\UserAction::APPLIES_TO_SINGLE_RECORD], true)) {
+            && in_array($this->action->appliesTo, [Model\UserAction::APPLIES_TO_NO_RECORDS, Model\UserAction::APPLIES_TO_SINGLE_RECORD], true)
+        ) {
             $this->action = $this->action->getActionForEntity($this->action->getModel()->createEntity());
         }
 
diff --git a/src/UserAction/VpExecutor.php b/src/UserAction/VpExecutor.php
index fc1235f7a1..1d62fe6148 100644
--- a/src/UserAction/VpExecutor.php
+++ b/src/UserAction/VpExecutor.php
@@ -115,9 +115,10 @@ public function executeModelAction(): void
     {
         $id = $this->stickyGet($this->name);
         if ($id && $this->action->appliesTo === Model\UserAction::APPLIES_TO_SINGLE_RECORD) {
-            $this->action = $this->action->getActionForEntity($this->action->getModel()->tryLoad($id));
+            $this->action = $this->action->getActionForEntity($this->action->getModel()->load($id));
         } elseif (!$this->action->isOwnerEntity()
-                && in_array($this->action->appliesTo, [Model\UserAction::APPLIES_TO_NO_RECORDS, Model\UserAction::APPLIES_TO_SINGLE_RECORD], true)) {
+            && in_array($this->action->appliesTo, [Model\UserAction::APPLIES_TO_NO_RECORDS, Model\UserAction::APPLIES_TO_SINGLE_RECORD], true)
+        ) {
             $this->action = $this->action->getActionForEntity($this->action->getModel()->createEntity());
         }