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diff --git a/lib/prado/framework/Web/UI/ActiveControls/TValueTriggeredCallback.php b/lib/prado/framework/Web/UI/ActiveControls/TValueTriggeredCallback.php
new file mode 100644
index 0000000..87a7d60
--- /dev/null
+++ b/lib/prado/framework/Web/UI/ActiveControls/TValueTriggeredCallback.php
@@ -0,0 +1,118 @@
+<?php
+/**
+ * TValueTriggeredCallback class file.
+ *
+ * @author Wei Zhuo <weizhuo[at]gamil[dot]com>
+ * @link https://github.com/pradosoft/prado
+ * @copyright Copyright &copy; 2005-2015 The PRADO Group
+ * @license https://github.com/pradosoft/prado/blob/master/COPYRIGHT
+ * @package System.Web.UI.ActiveControls
+ */
+
+Prado::using('System.Web.UI.ActiveControls.TTriggeredCallback');
+
+/**
+ * TValueTriggeredCallback Class
+ *
+ * Observes the value with {@link setPropertyName PropertyName} of a
+ * control with {@link setControlID ControlID}. Changes to the observed
+ * property value will trigger a new callback request. The property value is checked
+ * for changes every{@link setInterval Interval} seconds.
+ *
+ * A {@link setDecayRate DecayRate} can be set to increase the polling
+ * interval linearly if no changes are observed. Once a change is
+ * observed, the polling interval is reset to the original value.
+ *
+ * @author Wei Zhuo <weizhuo[at]gmail[dot]com>
+ * @package System.Web.UI.ActiveControls
+ * @since 3.1
+ */
+class TValueTriggeredCallback extends TTriggeredCallback
+{
+	/**
+	 * @return string The control property name to observe value changes.
+	 */
+	public function getPropertyName()
+	{
+		return $this->getViewState('PropertyName', '');
+	}
+
+	/**
+	 * Sets the control property name to observe value changes that fires the callback request.
+	 * @param string The control property name to observe value changes.
+	 */
+	public function setPropertyName($value)
+	{
+		$this->setViewState('PropertyName', $value, '');
+	}
+
+	/**
+	 * Sets the polling interval in seconds to observe property changes.
+	 * Default is 1 second.
+	 * @param float polling interval in seconds.
+	 */
+	public function setInterval($value)
+	{
+		$this->setViewState('Interval', TPropertyValue::ensureFloat($value), 1);
+	}
+
+	/**
+	 * @return float polling interval, 1 second default.
+	 */
+	public function getInterval()
+	{
+		return $this->getViewState('Interval', 1);
+	}
+
+	/**
+	 * Gets the decay rate between callbacks. Default is 0;
+	 * @return float decay rate between callbacks.
+	 */
+	public function getDecayRate()
+	{
+		return $this->getViewState('Decay', 0);
+	}
+
+	/**
+	 * Sets the decay rate between callback. Default is 0;
+	 * @param float decay rate between callbacks.
+	 */
+	public function setDecayRate($value)
+	{
+		$decay = TPropertyValue::ensureFloat($value);
+		if($decay < 0)
+			throw new TConfigurationException('callback_decay_be_not_negative', $this->getID());
+		$this->setViewState('Decay', $decay);
+	}
+
+	/**
+	 * @return array list of timer options for client-side.
+	 */
+	protected function getTriggerOptions()
+	{
+		$options = parent::getTriggerOptions();
+		$options['PropertyName'] = $this->getPropertyName();
+		$options['Interval'] = $this->getInterval();
+		$options['Decay'] = $this->getDecayRate();
+		return $options;
+	}
+
+	/**
+	 * Registers the javascript code for initializing the active control.
+	 * @param THtmlWriter the renderer.
+	 */
+	public function render($writer)
+	{
+		parent::render($writer);
+		$this->getActiveControl()->registerCallbackClientScript(
+			$this->getClientClassName(), $this->getTriggerOptions());
+	}
+
+	/**
+	 * @return string corresponding javascript class name for TEventTriggeredCallback.
+	 */
+	protected function getClientClassName()
+	{
+		return 'Prado.WebUI.TValueTriggeredCallback';
+	}
+}