diff --git a/apps/advanced/composer.json b/apps/advanced/composer.json
index 88522f2..46ef86a 100644
--- a/apps/advanced/composer.json
+++ b/apps/advanced/composer.json
@@ -20,12 +20,12 @@
 	},
 	"scripts": {
 		"post-create-project-cmd": [
-			"yii\\composer\\InstallHandler::setPermissions",
+			"yii\\composer\\Installer::setPermission",
 			"./init"
 		]
 	},
 	"extra": {
-		"yii-install-writable": [
+		"writable": [
 			"backend/runtime",
 			"backend/web/assets",
 
diff --git a/apps/basic/composer.json b/apps/basic/composer.json
index e9af8b7..93e8253 100644
--- a/apps/basic/composer.json
+++ b/apps/basic/composer.json
@@ -20,15 +20,15 @@
 	},
 	"scripts": {
 		"post-create-project-cmd": [
-			"yii\\composer\\InstallHandler::setPermissions"
+			"yii\\composer\\Installer::setPermission"
 		]
 	},
 	"extra": {
-		"yii-install-writable": [
+		"writable": [
 			"runtime",
 			"web/assets"
 		],
-		"yii-install-executable": [
+		"executable": [
 			"yii"
 		]
 	}
diff --git a/docs/guide/apps-advanced.md b/docs/guide/apps-advanced.md
index 9c6532a..9669217 100644
--- a/docs/guide/apps-advanced.md
+++ b/docs/guide/apps-advanced.md
@@ -144,11 +144,11 @@ directory:
 	},
 	"scripts": {
 		"post-create-project-cmd": [
-			"yii\\composer\\InstallHandler::setPermissions"
+			"yii\\composer\\Installer::setPermission"
 		]
 	},
 	"extra": {
-		"yii-install-writable": [
+		"writable": [
 			"backend/runtime",
 			"backend/web/assets",
 
diff --git a/docs/guide/apps-basic.md b/docs/guide/apps-basic.md
index 0f366af..386c202 100644
--- a/docs/guide/apps-basic.md
+++ b/docs/guide/apps-basic.md
@@ -134,15 +134,15 @@ directory:
 	},
 	"scripts": {
 		"post-create-project-cmd": [
-			"yii\\composer\\InstallHandler::setPermissions"
+			"yii\\composer\\Installer::setPermission"
 		]
 	},
 	"extra": {
-		"yii-install-writable": [
+		"writable": [
 			"runtime",
 			"web/assets"
 		],
-		"yii-install-executable": [
+		"executable": [
 			"yii"
 		]
 	}
diff --git a/extensions/composer/yii/composer/InstallHandler.php b/extensions/composer/yii/composer/InstallHandler.php
deleted file mode 100644
index 289262f..0000000
--- a/extensions/composer/yii/composer/InstallHandler.php
+++ /dev/null
@@ -1,97 +0,0 @@
-<?php
-/**
- * @link http://www.yiiframework.com/
- * @copyright Copyright (c) 2008 Yii Software LLC
- * @license http://www.yiiframework.com/license/
- */
-
-namespace yii\composer;
-
-use Composer\Script\CommandEvent;
-use yii\console\Application;
-use yii\console\Exception;
-
-defined('YII_DEBUG') or define('YII_DEBUG', true);
-
-// fcgi doesn't have STDIN defined by default
-defined('STDIN') or define('STDIN', fopen('php://stdin', 'r'));
-
-/**
- * InstallHandler is called by Composer after it installs/updates the current package.
- *
- * @author Qiang Xue <qiang.xue@gmail.com>
- * @author Tobias Munk <schmunk@usrbin.de>
- * @since 2.0
- */
-class InstallHandler
-{
-	const PARAM_WRITABLE = 'yii-install-writable';
-	const PARAM_EXECUTABLE = 'yii-install-executable';
-	const PARAM_CONFIG = 'yii-install-config';
-	const PARAM_COMMANDS = 'yii-install-commands';
-
-	/**
-	 * Sets the correct permissions of files and directories.
-	 * @param CommandEvent $event
-	 */
-	public static function setPermissions($event)
-	{
-		$options = array_merge([
-			self::PARAM_WRITABLE => [],
-			self::PARAM_EXECUTABLE => [],
-		], $event->getComposer()->getPackage()->getExtra());
-
-		foreach ((array)$options[self::PARAM_WRITABLE] as $path) {
-			echo "Setting writable: $path ...";
-			if (is_dir($path)) {
-				chmod($path, 0777);
-				echo "done\n";
-			} else {
-				echo "The directory was not found: " . getcwd() . DIRECTORY_SEPARATOR . $path;
-				return;
-			}
-		}
-
-		foreach ((array)$options[self::PARAM_EXECUTABLE] as $path) {
-			echo "Setting executable: $path ...";
-			if (is_file($path)) {
-				chmod($path, 0755);
-				echo "done\n";
-			} else {
-				echo "\n\tThe file was not found: " . getcwd() . DIRECTORY_SEPARATOR . $path . "\n";
-				return;
-			}
-		}
-	}
-
-	/**
-	 * Executes a yii command.
-	 * @param CommandEvent $event
-	 */
-	public static function run($event)
-	{
-		$options = array_merge([
-			self::PARAM_COMMANDS => [],
-		], $event->getComposer()->getPackage()->getExtra());
-
-		if (!isset($options[self::PARAM_CONFIG])) {
-			throw new Exception('Please specify the "' . self::PARAM_CONFIG . '" parameter in composer.json.');
-		}
-		$configFile = getcwd() . '/' . $options[self::PARAM_CONFIG];
-		if (!is_file($configFile)) {
-			throw new Exception("Config file does not exist: $configFile");
-		}
-
-		require_once(__DIR__ . '/../../../yii2/yii/Yii.php');
-		$application = new Application(require($configFile));
-		$request = $application->getRequest();
-
-		foreach ((array)$options[self::PARAM_COMMANDS] as $command) {
-			$params = str_getcsv($command, ' '); // see http://stackoverflow.com/a/6609509/291573
-			$request->setParams($params);
-			list($route, $params) = $request->resolve();
-			echo "Running command: yii {$command}\n";
-			$application->runAction($route, $params);
-		}
-	}
-}
diff --git a/extensions/jui/yii/jui/AccordionAsset.php b/extensions/jui/yii/jui/AccordionAsset.php
index a032429..05c1e20 100644
--- a/extensions/jui/yii/jui/AccordionAsset.php
+++ b/extensions/jui/yii/jui/AccordionAsset.php
@@ -6,6 +6,7 @@
  */
 
 namespace yii\jui;
+
 use yii\web\AssetBundle;
 
 /**
diff --git a/extensions/jui/yii/jui/Extension.php b/extensions/jui/yii/jui/Extension.php
new file mode 100644
index 0000000..4b680ce
--- /dev/null
+++ b/extensions/jui/yii/jui/Extension.php
@@ -0,0 +1,27 @@
+<?php
+/**
+ * @link http://www.yiiframework.com/
+ * @copyright Copyright (c) 2008 Yii Software LLC
+ * @license http://www.yiiframework.com/license/
+ */
+
+namespace yii\jui;
+
+use Yii;
+
+/**
+ * This is the bootstrap class for the Yii JUI extension.
+ *
+ * @author Qiang Xue <qiang.xue@gmail.com>
+ * @since 2.0
+ */
+class Extension extends \yii\base\Extension
+{
+	/**
+	 * @inheritdoc
+	 */
+	public static function init()
+	{
+		Yii::setAlias('@yii/jui', __DIR__);
+	}
+}