diff --git a/framework/yii/bootstrap/Collapse.php b/framework/yii/bootstrap/Collapse.php
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+++ b/framework/yii/bootstrap/Collapse.php
@@ -0,0 +1,133 @@
+<?php
+/**
+ * @link http://www.yiiframework.com/
+ * @copyright Copyright (c) 2008 Yii Software LLC
+ * @license http://www.yiiframework.com/license/
+ */
+
+namespace yii\bootstrap;
+
+use yii\base\InvalidConfigException;
+use yii\helpers\base\ArrayHelper;
+use yii\helpers\Html;
+
+/**
+ * Collapse renders an accordion bootstrap javascript component.
+ *
+ * For example:
+ *
+ * ```php
+ * echo Collapse::widget(array(
+ *     'items' => array(
+ *         // equivalent to the above
+ *         'Collapsible Group Item #1' => array(
+ *             'content' => 'Anim pariatur cliche...',
+ *             // open its content by default
+ *             'contentOptions' => array('class'=>'in')
+ *         ),
+ *         // another group item
+ *         'Collapsible Group Item #2' => array(
+ *             'content' => 'Anim pariatur cliche...',
+ *             'contentOptions' => array(...),
+ *             'options' => array(...),
+ *         ),
+ *     )
+ * ));
+ * ```
+ *
+ * @see http://twitter.github.io/bootstrap/javascript.html#collapse
+ * @author Antonio Ramirez <amigo.cobos@gmail.com>
+ * @since 2.0
+ */
+class Collapse extends Widget
+{
+	/**
+	 * @var array list of groups in the collapse widget. Each array element represents a single
+	 * group with the following structure:
+	 *
+	 * ```php
+	 * // item key is the actual group header
+	 * 'Collapsible Group Item #1' => array(
+	 *     // required, the content (HTML) of the group
+	 *     'content' => 'Anim pariatur cliche...',
+	 *     // optional the HTML attributes of the content group
+	 *     'contentOptions'=> array(),
+	 *     // optional the HTML attributes of the group
+	 *     'options'=> array(),
+	 * )
+	 * ```
+	 */
+	public $items = array();
+
+
+	/**
+	 * Initializes the widget.
+	 */
+	public function init()
+	{
+		parent::init();
+		$this->addCssClass($this->options, 'accordion');
+	}
+
+	/**
+	 * Renders the widget.
+	 */
+	public function run()
+	{
+		echo Html::beginTag('div', $this->options) . "\n";
+		echo $this->renderItems() . "\n";
+		echo Html::endTag('div') . "\n";
+		$this->registerPlugin('collapse');
+	}
+
+	/**
+	 * Renders collapsible items as specified on [[items]].
+	 * @return string the rendering result
+	 */
+	public function renderItems()
+	{
+		$items = array();
+		$index = 0;
+		foreach ($this->items as $header => $item) {
+			$options = ArrayHelper::getValue($item, 'options', array());
+			$this->addCssClass($options, 'accordion-group');
+			$items[] = Html::tag('div', $this->renderItem($header, $item, ++$index), $options);
+		}
+
+		return implode("\n", $items);
+	}
+
+	/**
+	 * Renders a single collapsible item group
+	 * @param string $header a label of the item group [[items]]
+	 * @param array $item a single item from [[items]]
+	 * @param integer $index the item index as each item group content must have an id
+	 * @return string the rendering result
+	 * @throws InvalidConfigException
+	 */
+	public function renderItem($header, $item, $index)
+	{
+		if (isset($item['content'])) {
+			$id = $this->options['id'] . '-collapse' . $index;
+			$options = ArrayHelper::getValue($item, 'contentOptions', array());
+			$options['id'] = $id;
+			$this->addCssClass($options, 'accordion-body collapse');
+
+			$header = Html::a($header, '#' . $id, array(
+					'class' => 'accordion-toggle',
+					'data-toggle' => 'collapse',
+					'data-parent' => '#' . $this->options['id']
+				)) . "\n";
+
+			$content = Html::tag('div', $item['content'], array('class' => 'accordion-inner')) . "\n";
+		} else {
+			throw new InvalidConfigException('The "content" option is required.');
+		}
+		$group = array();
+
+		$group[] = Html::tag('div', $header, array('class' => 'accordion-heading'));
+		$group[] = Html::tag('div', $content, $options);
+
+		return implode("\n", $group);
+	}
+}
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