diff --git a/README.md b/README.md
index c2e85fe..b2f2a50 100644
--- a/README.md
+++ b/README.md
@@ -35,14 +35,22 @@ Disclaimer: This extension and/or its documentation is nowhere near complete. Pr
 
 This extension adds following methods to `Nette\Forms\Container` and thus to all derived classes:
 
-- `addDynamicSelect($name, $title, $items, $itemFactory)`
+- `addDynamicSelect($name, $title, $items, $itemFactory = null, $config = [])`
     - dynamic select with one value
-- `addDynamicMultiSelect($name, $title, $items, $itemFactory)`
+- `addDynamicMultiSelect($name, $title, $items, $itemFactory = null, $config = [])`
     - dynamic select with multiple values
-- `addAjaxSelect($name, $title, $entityName = $name)`
+- `addAjaxSelect($name, $title, $entityName = $name, $config = [])`
     - ajax select with one value
-- `addAjaxMultiSelect($name, $title, $entityName = $name)`
+- `addAjaxMultiSelect($name, $title, $entityName = $name, $config = [])`
     - ajax select with multiple values
+   
+### Config
+
+```php
+[
+	AjaxSelectExtension::CONFIG_INVALID_VALUE_MODE => AjaxSelectExtension::INVALID_VALUE_MODE_*,
+]
+```
 
 ### Dynamic Select
 
diff --git a/src/Components/AjaxSelect/DI/AjaxSelectExtension.php b/src/Components/AjaxSelect/DI/AjaxSelectExtension.php
index fe8694d..835e347 100644
--- a/src/Components/AjaxSelect/DI/AjaxSelectExtension.php
+++ b/src/Components/AjaxSelect/DI/AjaxSelectExtension.php
@@ -84,21 +84,23 @@ public function afterCompile(\Nette\PhpGenerator\ClassType $class) {
 		$initialize->addBody(__CLASS__ . '::register($this, ?);', [ $this->config ]);
 	}
 
-	public static function register(\Nette\DI\Container $container, $config) {
+	public static function register(\Nette\DI\Container $container, $globalConfig) {
 		// lazy service getter
 		$serviceGetter = function () use ($container) {
 			return $container->getByType(AjaxSelect\Services\AjaxService::class);
 		};
 
 		// control factory factory :)
-		$factory = function ($class) use ($serviceGetter, $config) {
+		$factory = function ($class) use ($serviceGetter, $globalConfig) {
 
 			if (in_array($class, [AjaxSelect\AjaxSelect::class, AjaxSelect\AjaxMultiSelect::class])) {
 				// pro ajax entity
-				return function (\Nette\Forms\Container $container, $name, $label = NULL, $entityName = NULL) use ($class, $serviceGetter, $config) {
+				return function (\Nette\Forms\Container $container, $name, $label = NULL, $entityName = NULL, $config = []) use ($class, $serviceGetter, $globalConfig) {
 					/** @var AjaxSelect\AjaxSelect|AjaxSelect\DynamicSelect|mixed $control */
 					$control = new $class($label);
 
+					$config = array_intersect_key($config, array_flip([static::CONFIG_INVALID_VALUE_MODE])) + $globalConfig;
+
 					// set invalid value mode
 					$control->setInvalidValueMode($config[static::CONFIG_INVALID_VALUE_MODE]);
 
@@ -115,10 +117,12 @@ public static function register(\Nette\DI\Container $container, $config) {
 			} elseif (in_array($class, [AjaxSelect\DynamicSelect::class, AjaxSelect\DynamicMultiSelect::class])) {
 
 				// pro dymanic select
-				return function (\Nette\Forms\Container $container, $name, $label = NULL, $items = NULL, $itemFactory = NULL) use ($class, $serviceGetter, $config) {
+				return function (\Nette\Forms\Container $container, $name, $label = NULL, $items = NULL, $itemFactory = NULL, $config = []) use ($class, $serviceGetter, $globalConfig) {
 					/** @var AjaxSelect\AjaxSelect|AjaxSelect\DynamicSelect|mixed $control */
 					$control = new $class($label, $items);
 
+					$config = array_intersect_key($config, array_flip([static::CONFIG_INVALID_VALUE_MODE])) + $globalConfig;
+
 					// set invalid value mode
 					$control->setInvalidValueMode($config[static::CONFIG_INVALID_VALUE_MODE]);