diff --git a/framework/base/Component.php b/framework/base/Component.php
index 72e4e3b..730e685 100644
--- a/framework/base/Component.php
+++ b/framework/base/Component.php
@@ -108,7 +108,7 @@ class Component extends Object
 			return $this->_b[$name];
 		} elseif (is_array($this->_b)) { // a behavior property
 			foreach ($this->_b as $object) {
-				if (property_exists($object, $name) || $object->canGetProperty($name)) {
+				if ($object->canGetProperty($name)) {
 					return $object->$name;
 				}
 			}
@@ -145,7 +145,7 @@ class Component extends Object
 			return $this->_e[$name]->add($value);
 		} elseif (is_array($this->_b)) {  // behavior
 			foreach ($this->_b as $object) {
-				if (property_exists($object, $name) || $object->canSetProperty($name)) {
+				if ($object->canSetProperty($name)) {
 					return $object->$name = $value;
 				}
 			}
@@ -182,7 +182,7 @@ class Component extends Object
  			return true;
  		} elseif (is_array($this->_b)) {
 			foreach ($this->_b as $object) {
-				if (property_exists($object, $name) || $object->canGetProperty($name)) {
+				if ($object->canGetProperty($name)) {
 					return $object->$name !== null;
 				}
 			}
@@ -201,27 +201,25 @@ class Component extends Object
 	 * Do not call this method directly as it is a PHP magic method that
 	 * will be implicitly called when executing `unset($component->property)`.
 	 * @param string $name the property name
-	 * @return null
 	 * @throws Exception if the property is read only.
 	 */
 	public function __unset($name)
 	{
 		$setter = 'set' . $name;
 		if (method_exists($this, $setter)) {  // write property
-			$this->$setter(null);
+			return $this->$setter(null);
 		} elseif (method_exists($this, $name) && strncasecmp($name, 'on', 2) === 0) {  // event
-			unset($this->_e[strtolower($name)]);
+			return unset($this->_e[strtolower($name)]);
 		} elseif (isset($this->_b[$name])) {  // behavior
-			$this->detachBehavior($name);
+			return $this->detachBehavior($name);
 		} elseif (is_array($this->_b)) {  // behavior property
 			foreach ($this->_b as $object) {
-				if (property_exists($object, $name)) {
+				if ($object->canSetProperty($name)) {
 					return $object->$name = null;
-				} elseif ($object->canSetProperty($name)) {
-					return $object->$setter(null);
 				}
 			}
-		} elseif (method_exists($this, 'get' . $name)) {
+		}
+		if (method_exists($this, 'get' . $name)) {
 			throw new Exception('Unsetting read-only property: ' . get_class($this) . '.' . $name);
 		}
 	}
@@ -236,24 +234,22 @@ class Component extends Object
 	 * Do not call this method directly as it is a PHP magic method that
 	 * will be implicitly called when an unknown method is being invoked.
 	 * @param string $name the method name
-	 * @param array $parameters method parameters
+	 * @param array $params method parameters
 	 * @return mixed the method return value
 	 */
-	public function __call($name, $parameters)
+	public function __call($name, $params)
 	{
-		if ($this->canGetProperty($name)) {
+		if ($this->canGetProperty($name, false)) {
 			$func = $this->$name;
 			if ($func instanceof \Closure) {
-				return call_user_func_array($func, $parameters);
+				return call_user_func_array($func, $params);
 			}
 		}
 
-		if ($this->_b !== null)
-		{
-			foreach ($this->_b as $object)
-			{
+		if ($this->_b !== null) {
+			foreach ($this->_b as $object) {
 				if (method_exists($object, $name)) {
-					return call_user_func_array(array($object, $name), $parameters);
+					return call_user_func_array(array($object, $name), $params);
 				}
 			}
 		}
diff --git a/framework/base/Object.php b/framework/base/Object.php
index 27f9ff0..e396792 100644
--- a/framework/base/Object.php
+++ b/framework/base/Object.php
@@ -63,6 +63,13 @@ namespace yii\base;
 class Object
 {
 	/**
+	 * Constructor.
+	 */
+	public function __construct()
+	{
+	}
+
+	/**
 	 * Returns the value of a object property.
 	 *
 	 * Do not call this method directly as it is a PHP magic method that
@@ -78,8 +85,9 @@ class Object
 		$getter = 'get' . $name;
 		if (method_exists($this, $getter)) {
 			return $this->$getter();
+		} else {
+			throw new Exception('Getting unknown property: ' . get_class($this) . '.' . $name);
 		}
-		throw new Exception('Getting unknown property: ' . get_class($this) . '.' . $name);
 	}
 
 	/**
@@ -89,7 +97,6 @@ class Object
 	 * will be implicitly called when executing `$object->property = $value;`.
 	 * @param string $name the property name or the event name
 	 * @param mixed $value the property value
-	 * @return mixed value that was set
 	 * @throws Exception if the property is not defined or read-only.
 	 * @see __get
 	 */
@@ -97,9 +104,8 @@ class Object
 	{
 		$setter = 'set' . $name;
 		if (method_exists($this, $setter)) {
-			return $this->$setter($value);
-		}
-		if (method_exists($this, 'get' . $name)) {
+			$this->$setter($value);
+		} elseif (method_exists($this, 'get' . $name)) {
 			throw new Exception('Setting read-only property: ' . get_class($this) . '.' . $name);
 		} else {
 			throw new Exception('Setting unknown property: ' . get_class($this) . '.' . $name);
@@ -121,8 +127,9 @@ class Object
 		$getter = 'get' . $name;
 		if (method_exists($this, $getter)) { // property is not null
 			return $this->$getter() !== null;
+		} else {
+			return false;
 		}
-		return false;
 	}
 
 	/**
@@ -147,17 +154,42 @@ class Object
 	}
 
 	/**
+	 * Calls the named method which is not a class method.
+	 * If the name refers to a component property whose value is
+	 * an anonymous function, the method will execute the function.
+	 *
+	 * Do not call this method directly as it is a PHP magic method that
+	 * will be implicitly called when an unknown method is being invoked.
+	 * @param string $name the method name
+	 * @param array $params method parameters
+	 * @return mixed the method return value
+	 */
+	public function __call($name, $params)
+	{
+		if ($this->canGetProperty($name, false)) {
+			$getter = 'get' . $name;
+			$func = $this->$getter;
+			if ($func instanceof \Closure) {
+				return call_user_func_array($func, $params);
+			}
+		}
+		throw new Exception('Unknown method: ' . get_class($this) . "::$name()");
+	}
+
+	/**
 	 * Returns a value indicating whether a property is defined.
 	 * A property is defined if there is a getter or setter method
 	 * defined in the class. Note that property names are case-insensitive.
 	 * @param string $name the property name
+	 * @param boolean $checkVar whether to treat member variables as properties
 	 * @return boolean whether the property is defined
 	 * @see canGetProperty
 	 * @see canSetProperty
 	 */
-	public function hasProperty($name)
+	public function hasProperty($name, $checkVar = true)
 	{
-		return $this->canGetProperty($name) || $this->canSetProperty($name);
+		return $this->canGetProperty($name, false) || $this->canSetProperty($name, false)
+			|| $checkVar && property_exists($this, $name);
 	}
 
 	/**
@@ -165,12 +197,13 @@ class Object
 	 * A property can be read if the class has a getter method
 	 * for the property name. Note that property name is case-insensitive.
 	 * @param string $name the property name
+	 * @param boolean $checkVar whether to treat member variables as properties
 	 * @return boolean whether the property can be read
 	 * @see canSetProperty
 	 */
-	public function canGetProperty($name)
+	public function canGetProperty($name, $checkVar = true)
 	{
-		return method_exists($this, 'get' . $name);
+		return method_exists($this, 'get' . $name) || $checkVar && property_exists($this, $name);
 	}
 
 	/**
@@ -178,12 +211,13 @@ class Object
 	 * A property can be written if the class has a setter method
 	 * for the property name. Note that property name is case-insensitive.
 	 * @param string $name the property name
+	 * @param boolean $checkVar whether to treat member variables as properties
 	 * @return boolean whether the property can be written
 	 * @see canGetProperty
 	 */
-	public function canSetProperty($name)
+	public function canSetProperty($name, $checkVar = true)
 	{
-		return method_exists($this, 'set' . $name);
+		return method_exists($this, 'set' . $name) || $checkVar && property_exists($this, $name);
 	}
 
 	/**
diff --git a/framework/db/dao/Command.php b/framework/db/dao/Command.php
index 84fb895..8e21514 100644
--- a/framework/db/dao/Command.php
+++ b/framework/db/dao/Command.php
@@ -20,15 +20,20 @@ use yii\db\Exception;
  *
  * To execute a non-query SQL (such as INSERT, DELETE, UPDATE), call [[execute]].
  * To execute a SQL statement that returns result data set (such as SELECT),
- * use [[query]], [[queryRow]], [[queryColumn]], or [[queryScalar]].
+ * use [[queryAll]], [[queryRow]], [[queryColumn]], [[queryScalar]], or [[query]].
+ * For example,
+ *
+ * ~~~
+ * $users = \Yii::app()->db->createCommand('SELECT * FROM tbl_user')->queryAll();
+ * ~~~
  *
  * Command supports SQL statement preparation and parameter binding.
  * Call [[bindValue]] to bind a value to a SQL parameter;
  * Call [[bindParam]] to bind a PHP variable to a SQL parameter.
  * When binding a parameter, the SQL statement is automatically prepared.
- * You may also call [[prepare]] to explicitly prepare a SQL statement.
+ * You may also call [[prepare]] explicitly to prepare a SQL statement.
  *
- * Command can also be used as a query builder that builds and executes a SQL statement
+ * Command can be used as a query builder that builds and executes a SQL statement
  * from code fragments. For example,
  *
  * ~~~
diff --git a/framework/db/dao/DataReader.php b/framework/db/dao/DataReader.php
index fa36057..ccb437e 100644
--- a/framework/db/dao/DataReader.php
+++ b/framework/db/dao/DataReader.php
@@ -37,6 +37,9 @@ use yii\db\Exception;
  */
 class DataReader extends \yii\base\Object implements \Iterator, \Countable
 {
+	/**
+	 * @var \PDOStatement the PDOStatement associated with the command
+	 */
 	private $_statement;
 	private $_closed = false;
 	private $_row;
@@ -48,7 +51,7 @@ class DataReader extends \yii\base\Object implements \Iterator, \Countable
 	 */
 	public function __construct(Command $command)
 	{
-		$this->_statement = $command->getPdoStatement();
+		$this->_statement = $command->pdoStatement;
 		$this->_statement->setFetchMode(\PDO::FETCH_ASSOC);
 	}
 
diff --git a/framework/db/dao/Transaction.php b/framework/db/dao/Transaction.php
index 172a38d..eaba4af 100644
--- a/framework/db/dao/Transaction.php
+++ b/framework/db/dao/Transaction.php
@@ -45,7 +45,6 @@ class Transaction extends \yii\base\Object
 	public $active;
 	/**
 	 * @var Connection the database connection that this transaction is associated with.
-	 * This property is set true when the transaction is started.
 	 */
 	public $connection;
 
@@ -70,9 +69,8 @@ class Transaction extends \yii\base\Object
 			\Yii::trace('Committing transaction', __CLASS__);
 			$this->connection->pdo->commit();
 			$this->active = false;
-		}
-		else {
-			throw new Exception('Transaction is inactive and cannot perform commit operation.');
+		} else {
+			throw new Exception('Failed to commit transaction: transaction was inactive.');
 		}
 	}
 
@@ -86,9 +84,8 @@ class Transaction extends \yii\base\Object
 			\Yii::trace('Rolling back transaction', __CLASS__);
 			$this->connection->pdo->rollBack();
 			$this->active = false;
-		}
-		else {
-			throw new Exception('Transaction is inactive and cannot perform roll back operation.');
+		} else {
+			throw new Exception('Failed to roll back transaction: transaction was inactive.');
 		}
 	}
 }
diff --git a/license.md b/license.md
index 4caa32b..92a3254 100644
--- a/license.md
+++ b/license.md
@@ -7,6 +7,7 @@ All rights reserved.
 Redistribution and use in source and binary forms, with or without
 modification, are permitted provided that the following conditions
 are met:
+
  * Redistributions of source code must retain the above copyright
    notice, this list of conditions and the following disclaimer.
  * Redistributions in binary form must reproduce the above copyright
diff --git a/todo.md b/todo.md
index 71678cb..ad23eb6 100644
--- a/todo.md
+++ b/todo.md
@@ -58,6 +58,4 @@
 - assets
     * ability to manage scripts order (store these in a vector?)
 	* http://ryanbigg.com/guides/asset_pipeline.html, http://guides.rubyonrails.org/asset_pipeline.html, use content hash instead of mtime + directory hash.
-- collections
-    * http://code.google.com/p/yii/source/detail?r=3428
 - Requirement checker
\ No newline at end of file