diff --git a/framework/YiiBase.php b/framework/YiiBase.php
index 5767e1f..e6f5a00 100644
--- a/framework/YiiBase.php
+++ b/framework/YiiBase.php
@@ -372,10 +372,18 @@ class YiiBase
 			$object = new $type;
 		}
 
+		if ($object instanceof \yii\base\Component) {
+			$object->preinit();
+		}
+
 		foreach ($config as $key => $value) {
 			$object->$key = $value;
 		}
 
+		if ($object instanceof \yii\base\Component) {
+			$object->init();
+		}
+
 		return $object;
 	}
 
diff --git a/framework/base/Component.php b/framework/base/Component.php
index dc1ef53..5beb094 100644
--- a/framework/base/Component.php
+++ b/framework/base/Component.php
@@ -101,6 +101,8 @@ namespace yii\base;
  * [[disableBehavior]], respectively. When disabled, the behavior's public properties and methods
  * cannot be accessed via the component.
  *
+ * Components created via [[\Yii::createComponent]] have life cycles. In particular,
+ *
  * @author Qiang Xue <qiang.xue@gmail.com>
  * @since 2.0
  */
@@ -170,17 +172,17 @@ class Component
 	public function __set($name, $value)
 	{
 		$setter = 'set' . $name;
-		if (method_exists($this, $setter)) {
+		if (method_exists($this, $setter)) {  // write property
 			return $this->$setter($value);
 		}
-		elseif (method_exists($this, $name) && strncasecmp($name, 'on', 2) === 0) {
+		elseif (method_exists($this, $name) && strncasecmp($name, 'on', 2) === 0) {  // event
 			$name = strtolower($name);
 			if (!isset($this->_e[$name])) {
 				$this->_e[$name] = new Vector;
 			}
 			return $this->_e[$name]->add($value);
 		}
-		elseif (is_array($this->_b)) {
+		elseif (is_array($this->_b)) {  // behavior
 			foreach ($this->_b as $object) {
 				if ($object->getEnabled() && (property_exists($object, $name) || $object->canSetProperty($name))) {
 					return $object->$name = $value;
@@ -247,16 +249,16 @@ class Component
 	public function __unset($name)
 	{
 		$setter = 'set' . $name;
-		if (method_exists($this, $setter)) {
+		if (method_exists($this, $setter)) {  // write property
 			$this->$setter(null);
 		}
-		elseif (method_exists($this, $name) && strncasecmp($name, 'on', 2) === 0) {
+		elseif (method_exists($this, $name) && strncasecmp($name, 'on', 2) === 0) {  // event
 			unset($this->_e[strtolower($name)]);
 		}
-		elseif (isset($this->_b[$name])) {
+		elseif (isset($this->_b[$name])) {  // behavior
 			$this->detachBehavior($name);
 		}
-		elseif (is_array($this->_b)) {
+		elseif (is_array($this->_b)) {  // behavior property
 			foreach ($this->_b as $object) {
 				if ($object->getEnabled()) {
 					if (property_exists($object, $name)) {
@@ -308,6 +310,46 @@ class Component
 	}
 
 	/**
+	 * Initializes this component.
+	 * This method is invoked by [[\Yii::createComponent]] after its creates the new
+	 * component instance and initializes the component properties. In other words,
+	 * at this stage, the component has been fully configured.
+	 *
+	 * The default implementation calls [[behaviors]] and registers any available behaviors.
+	 * You may override this method with additional initialization logic (e.g. establish DB connection).
+	 * Make sure you call the parent implementation.
+	 */
+	public function init()
+	{
+		$this->attachBehaviors($this->behaviors());
+	}
+
+	/**
+	 * Returns a list of behaviors that this component should behave as.
+	 * The return value should be an array of behavior configurations indexed by
+	 * behavior names. Each behavior configuration can be either a string specifying
+	 * the behavior class or an array of the following structure:
+	 *
+	 * ~~~
+	 * 'behaviorName' => array(
+	 *     'class' => 'BehaviorClass',
+	 *     'property1' => 'value1',
+	 *     'property2' => 'value2',
+	 * )
+	 * ~~~
+	 *
+	 * Note that the behavior classes must extend from [[Behavior]]. Behaviors declared
+	 * in this method will be attached to the model when [[init]] is invoked.
+	 *
+	 * @return array the behavior configurations.
+	 * @see init
+	 */
+	public function behaviors()
+	{
+		return array();
+	}
+
+	/**
 	 * 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, property names are case-insensitive.
diff --git a/framework/base/Event.php b/framework/base/Event.php
index abb46ec..3ae3818 100644
--- a/framework/base/Event.php
+++ b/framework/base/Event.php
@@ -42,8 +42,9 @@ class Event extends Component
 	 * Constructor.
 	 * @param mixed $sender sender of the event
 	 */
-	public function __construct($sender=null)
+	public function __construct($sender=null, $params=null)
 	{
 		$this->sender = $sender;
+		$this->params = $params;
 	}
 }
diff --git a/framework/base/Model.php b/framework/base/Model.php
index 43fc3c8..429efb5 100644
--- a/framework/base/Model.php
+++ b/framework/base/Model.php
@@ -31,22 +31,10 @@ class Model extends Component implements \IteratorAggregate, \ArrayAccess
 	public function __construct($scenario='')
 	{
 		$this->_scenario = $scenario;
-		$this->init();
-		$this->attachBehaviors($this->behaviors());
 		$this->afterConstruct();
 	}
 
 	/**
-	 * Initializes this model.
-	 * This method is invoked in the constructor right after [[scenario]] is set.
-	 * You may override this method to provide code that is needed to initialize the model (e.g. setting
-	 * initial property values.)
-	 */
-	public function init()
-	{
-	}
-
-	/**
 	 * Returns the list of attribute names.
 	 * By default, this method returns all public non-static properties of the class.
 	 * You may override this method to change the default.
@@ -73,7 +61,7 @@ class Model extends Component implements \IteratorAggregate, \ArrayAccess
 	/**
 	 * Returns the validation rules for attributes.
 	 *
-	 * Validation rules are used by [[validate()]] to check if attribute values are valid.
+	 * Validation rules are used by [[validate]] to check if attribute values are valid.
 	 * Child classes may override this method to declare different validation rules.
 	 *
 	 * Each rule is an array with the following structure:
@@ -131,32 +119,6 @@ class Model extends Component implements \IteratorAggregate, \ArrayAccess
 	}
 
 	/**
-	 * Returns a list of behaviors that this model should behave as.
-	 * The return value should be an array of behavior configurations indexed by
-	 * behavior names. Each behavior configuration can be either a string specifying
-	 * the behavior class or an array of the following structure:
-	 *
-	 * ~~~
-	 * 'behaviorName' => array(
-	 *     'class' => 'BehaviorClass',
-	 *     'property1' => 'value1',
-	 *     'property2' => 'value2',
-	 * )
-	 * ~~~
-	 *
-	 * Note, the behavior classes must extend from [[Behavior]]. Behaviors declared
-	 * in this method will be attached to the model when it is instantiated.
-	 *
-	 * For more details about behaviors, see [[Component]].
-	 *
-	 * @return array the behavior configurations.
-	 */
-	public function behaviors()
-	{
-		return array();
-	}
-
-	/**
 	 * Returns the attribute labels.
 	 *
 	 * Attribute labels are mainly used for display purpose. For example, given an attribute
@@ -215,8 +177,8 @@ class Model extends Component implements \IteratorAggregate, \ArrayAccess
 	}
 
 	/**
-	 * This method is invoked after a model instance is created by new operator.
-	 * The default implementation raises the {@link onAfterConstruct} event.
+	 * This method is invoked at the end of model constructor.
+	 * The default implementation raises the [[onAfterConstruct]] event.
 	 * You may override this method to do postprocessing after model creation.
 	 * Make sure you call the parent implementation so that the event is raised properly.
 	 */
@@ -229,7 +191,7 @@ class Model extends Component implements \IteratorAggregate, \ArrayAccess
 
 	/**
 	 * This method is invoked before validation starts.
-	 * The default implementation calls {@link onBeforeValidate} to raise an event.
+	 * The default implementation raises the [[onBeforeValidate]] event.
 	 * You may override this method to do preliminary checks before validation.
 	 * Make sure the parent implementation is invoked so that the event can be raised.
 	 * @return boolean whether validation should be executed. Defaults to true.
@@ -247,7 +209,7 @@ class Model extends Component implements \IteratorAggregate, \ArrayAccess
 
 	/**
 	 * This method is invoked after validation ends.
-	 * The default implementation calls {@link onAfterValidate} to raise an event.
+	 * The default implementation raises the [[onAfterValidate]] event.
 	 * You may override this method to do postprocessing after validation.
 	 * Make sure the parent implementation is invoked so that the event can be raised.
 	 */
@@ -353,7 +315,7 @@ class Model extends Component implements \IteratorAggregate, \ArrayAccess
 	 * Returns a value indicating whether the attribute is required.
 	 * This is determined by checking if the attribute is associated with a
 	 * [[\yii\validators\RequiredValidator|required]] validation rule in the
-	 * current {@link scenario}.
+	 * current [[scenario]].
 	 * @param string $attribute attribute name
 	 * @return boolean whether the attribute is required
 	 */
@@ -601,7 +563,7 @@ class Model extends Component implements \IteratorAggregate, \ArrayAccess
 
 	/**
 	 * Returns the attribute names that are safe to be massively assigned.
-	 * A safe attribute is one that is associated with a validation rule in the current {@link scenario}.
+	 * A safe attribute is one that is associated with a validation rule in the current [[scenario]].
 	 * @return array safe attribute names
 	 */
 	public function getSafeAttributeNames()
diff --git a/todo.txt b/todo.txt
index 7cbe208..8b85adf 100644
--- a/todo.txt
+++ b/todo.txt
@@ -1,3 +1,4 @@
+- add more doc to Model
 - CompareValidator::clientValidateAttribute(): search for "CHtml::activeId"
 - FileValidator, UniqueValidator, ExistValidator, DateValidator: TBD
 - Can consider merging UniqueValidator and ExistValidator and using a NOT property.
@@ -8,4 +9,6 @@
 	* initialize properties
 	* init
 	* ...
-	* destruct
\ No newline at end of file
+	* destruct
+- get/setFlash() should be moved to session component
+- support optional parameter in URL patterns
\ No newline at end of file