diff --git a/framework/base/Dictionary.php b/framework/base/Dictionary.php
index 8c63a72..bae3db0 100644
--- a/framework/base/Dictionary.php
+++ b/framework/base/Dictionary.php
@@ -34,11 +34,6 @@ namespace yii\base;
 class Dictionary extends Component implements \IteratorAggregate, \ArrayAccess, \Countable
 {
 	/**
-	 * @var boolean whether this vector is read-only or not.
-	 * If the vector is read-only, adding or moving items will throw an exception.
-	 */
-	public $readOnly;
-	/**
 	 * @var array internal data storage
 	 */
 	private $_d = array();
@@ -48,15 +43,13 @@ class Dictionary extends Component implements \IteratorAggregate, \ArrayAccess,
 	 * Initializes the dictionary with an array or an iterable object.
 	 * @param mixed $data the initial data to be populated into the dictionary.
 	 * This can be an array or an iterable object.
-	 * @param boolean $readOnly whether the dictionary is read-only
 	 * @throws Exception if data is not well formed (neither an array nor an iterable object)
 	 */
-	public function __construct($data = array(), $readOnly = false)
+	public function __construct($data = array())
 	{
 		if ($data !== array()) {
 			$this->copyFrom($data);
 		}
-		$this->readOnly = $readOnly;
 	}
 
 	/**
@@ -119,16 +112,11 @@ class Dictionary extends Component implements \IteratorAggregate, \ArrayAccess,
 	 */
 	public function add($key, $value)
 	{
-		if (!$this->readOnly) {
-			if ($key === null) {
-				$this->_d[] = $value;
-			}
-			else {
-				$this->_d[$key] = $value;
-			}
+		if ($key === null) {
+			$this->_d[] = $value;
 		}
 		else {
-			throw new Exception('Dictionary is read only.');
+			$this->_d[$key] = $value;
 		}
 	}
 
@@ -140,19 +128,14 @@ class Dictionary extends Component implements \IteratorAggregate, \ArrayAccess,
 	 */
 	public function remove($key)
 	{
-		if (!$this->readOnly) {
-			if (isset($this->_d[$key])) {
-				$value = $this->_d[$key];
-				unset($this->_d[$key]);
-				return $value;
-			}
-			else { // the value is null
-				unset($this->_d[$key]);
-				return null;
-			}
+		if (isset($this->_d[$key])) {
+			$value = $this->_d[$key];
+			unset($this->_d[$key]);
+			return $value;
 		}
-		else {
-			throw new Exception('Dictionary is read only.');
+		else { // the value is null
+			unset($this->_d[$key]);
+			return null;
 		}
 	}
 
diff --git a/framework/base/Vector.php b/framework/base/Vector.php
index 1a8a306..fea1c8b 100644
--- a/framework/base/Vector.php
+++ b/framework/base/Vector.php
@@ -40,11 +40,6 @@ namespace yii\base;
 class Vector extends Component implements \IteratorAggregate, \ArrayAccess, \Countable
 {
 	/**
-	 * @var boolean whether this vector is read-only or not.
-	 * If the vector is read-only, adding or moving items will throw an exception.
-	 */
-	public $readOnly;
-	/**
 	 * @var array internal data storage
 	 */
 	private $_d = array();
@@ -58,15 +53,13 @@ class Vector extends Component implements \IteratorAggregate, \ArrayAccess, \Cou
 	 * Initializes the vector with an array or an iterable object.
 	 * @param mixed $data the initial data to be populated into the vector.
 	 * This can be an array or an iterable object.
-	 * @param boolean $readOnly whether the vector should be marked as read-only.
 	 * @throws Exception if data is not well formed (neither an array nor an iterable object)
 	 */
-	public function __construct($data = array(), $readOnly = false)
+	public function __construct($data = array())
 	{
 		if ($data !== array()) {
 			$this->copyFrom($data);
 		}
-		$this->readOnly = $readOnly;
 	}
 
 	/**
@@ -141,20 +134,15 @@ class Vector extends Component implements \IteratorAggregate, \ArrayAccess, \Cou
 	 */
 	public function insertAt($index, $item)
 	{
-		if (!$this->readOnly) {
-			if ($index === $this->_c) {
-				$this->_d[$this->_c++] = $item;
-			}
-			elseif ($index >= 0 && $index < $this->_c) {
-				array_splice($this->_d, $index, 0, array($item));
-				$this->_c++;
-			}
-			else {
-				throw new Exception('Index out of range: ' . $index);
-			}
+		if ($index === $this->_c) {
+			$this->_d[$this->_c++] = $item;
+		}
+		elseif ($index >= 0 && $index < $this->_c) {
+			array_splice($this->_d, $index, 0, array($item));
+			$this->_c++;
 		}
 		else {
-			throw new Exception('Vector is read only.');
+			throw new Exception('Index out of range: ' . $index);
 		}
 	}
 
@@ -187,24 +175,19 @@ class Vector extends Component implements \IteratorAggregate, \ArrayAccess, \Cou
 	 */
 	public function removeAt($index)
 	{
-		if (!$this->readOnly) {
-			if ($index >= 0 && $index < $this->_c) {
-				$this->_c--;
-				if ($index === $this->_c) {
-					return array_pop($this->_d);
-				}
-				else {
-					$item = $this->_d[$index];
-					array_splice($this->_d, $index, 1);
-					return $item;
-				}
+		if ($index >= 0 && $index < $this->_c) {
+			$this->_c--;
+			if ($index === $this->_c) {
+				return array_pop($this->_d);
 			}
 			else {
-				throw new Exception('Index out of range: ' . $index);
+				$item = $this->_d[$index];
+				array_splice($this->_d, $index, 1);
+				return $item;
 			}
 		}
 		else {
-			throw new Exception('Vector is read only.');
+			throw new Exception('Index out of range: ' . $index);
 		}
 	}
 
diff --git a/tests/unit/framework/base/DictionaryTest.php b/tests/unit/framework/base/DictionaryTest.php
index 1831026..de3f7de 100644
--- a/tests/unit/framework/base/DictionaryTest.php
+++ b/tests/unit/framework/base/DictionaryTest.php
@@ -37,12 +37,6 @@ class DictionaryTest extends \yii\test\TestCase
 		$this->assertEquals(2,$dictionary2->getCount());
 	}
 
-	public function testReadOnly()
-	{
-		$dictionary = new \yii\base\Dictionary(array(), true);
-		self::assertEquals(true, $dictionary->readOnly, 'List is not read-only');
-	}
-
 	public function testGetCount()
 	{
 		$this->assertEquals(2,$this->dictionary->getCount());
@@ -63,13 +57,6 @@ class DictionaryTest extends \yii\test\TestCase
 		$this->assertTrue($this->dictionary->contains('key3'));
 	}
 
-	public function testCanNotAddWhenReadOnly()
-	{
-		$dictionary = new \yii\base\Dictionary(array(), true);
-		$this->setExpectedException('yii\base\Exception');
-		$dictionary->add('key', 'value');
-	}
-
 	public function testRemove()
 	{
 		$this->dictionary->remove('key1');
@@ -78,13 +65,6 @@ class DictionaryTest extends \yii\test\TestCase
 		$this->assertTrue($this->dictionary->remove('unknown key')===null);
 	}
 
-	public function testCanNotRemoveWhenReadOnly()
-	{
-		$dictionary = new \yii\base\Dictionary(array('key' => 'value'), true);
-		$this->setExpectedException('yii\base\Exception');
-		$dictionary->remove('key');
-	}
-
 	public function testClear()
 	{
 		$this->dictionary->clear();
diff --git a/tests/unit/framework/base/VectorTest.php b/tests/unit/framework/base/VectorTest.php
index 15b920d..65901d6 100644
--- a/tests/unit/framework/base/VectorTest.php
+++ b/tests/unit/framework/base/VectorTest.php
@@ -37,14 +37,6 @@ class VectorTest extends \yii\test\TestCase
 		$this->assertEquals(2,$vector2->getCount());
 	}
 
-	public function testReadOnly()
-	{
-		$vector = new \yii\base\Vector(array(), true);
-		$this->assertEquals(true, $vector->readOnly, 'List is not read-only');
-		$vector = new \yii\base\Vector(array(), false);
-		$this->assertEquals(false, $vector->readOnly, 'List is read-only');
-	}
-
 	public function testGetCount()
 	{
 		$this->assertEquals(2,$this->vector->getCount());
@@ -70,13 +62,6 @@ class VectorTest extends \yii\test\TestCase
 		$this->vector->insertAt(4,$this->item3);
 	}
 
-	public function testCanNotInsertWhenReadOnly()
-	{
-		$vector = new \yii\base\Vector(array(), true);
-		$this->setExpectedException('yii\base\Exception');
-		$vector->insertAt(1, 2);
-	}
-
 	public function testRemove()
 	{
 		$this->vector->remove($this->item1);
@@ -99,13 +84,6 @@ class VectorTest extends \yii\test\TestCase
 		$this->vector->removeAt(2);
 	}
 
-	public function testCanNotRemoveWhenReadOnly()
-	{
-		$vector = new \yii\base\Vector(array(1, 2, 3), true);
-		$this->setExpectedException('yii\base\Exception');
-		$vector->removeAt(2);
-	}
-
 	public function testClear()
 	{
 		$this->vector->clear();