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diff --git a/lib/prado/framework/Util/TDataFieldAccessor.php b/lib/prado/framework/Util/TDataFieldAccessor.php
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+++ b/lib/prado/framework/Util/TDataFieldAccessor.php
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+<?php
+/**
+ * TDataFieldAccessor class file
+ *
+ * @author Qiang Xue <qiang.xue@gmail.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.Util
+ */
+
+/**
+ * TDataFieldAccessor class
+ *
+ * TDataFieldAccessor is a utility class that provides access to a field of some data.
+ * The accessor attempts to obtain the field value in the following order:
+ * - If the data is an array, then the field is treated as an array index
+ *   and the corresponding element value is returned;
+ * - If the data is a TMap or TList object, then the field is treated as a key
+ *   into the map or list, and the corresponding value is returned.
+ * - If the data is an object, the field is treated as a property or sub-property
+ *   defined with getter methods. For example, if the object has a method called
+ *   getMyValue(), then field 'MyValue' will retrieve the result of this method call.
+ *   If getMyValue() returns an object which contains a method getMySubValue(),
+ *   then field 'MyValue.MySubValue' will return that method call result.
+ *
+ * @author Qiang Xue <qiang.xue@gmail.com>
+ * @package System.Util
+ * @since 3.0
+ */
+class TDataFieldAccessor
+{
+	/**
+	 * Evaluates the data value at the specified field.
+	 * - If the data is an array, then the field is treated as an array index
+	 *   and the corresponding element value is returned; the field name can also include
+	 *   dots to access subarrays. For example a field named 'MyField.MySubField' will
+	 *   first try to access $data['MyField.MySubField'], then try $data['MyField']['MySubField'].
+	 * - If the data is a TMap or TList object, then the field is treated as a key
+	 *   into the map or list, and the corresponding value is returned.
+	 * - If the data is an object, the field is treated as a property or sub-property
+	 *   defined with getter methods. For example, if the object has a method called
+	 *   getMyValue(), then field 'MyValue' will retrieve the result of this method call.
+	 *   If getMyValue() returns an object which contains a method getMySubValue(),
+	 *   then field 'MyValue.MySubValue' will return that method call result.
+	 * @param mixed data containing the field value, can be an array, TMap, TList or object.
+	 * @param mixed field value
+	 * @return mixed value at the specified field
+	 * @throws TInvalidDataValueException if field or data is invalid
+	 */
+	public static function getDataFieldValue($data,$field)
+	{
+		try
+		{
+			if(is_array($data) || ($data instanceof ArrayAccess))
+			{
+				if(isset($data[$field]))
+					return $data[$field];
+
+				$tmp = $data;
+				foreach (explode(".", $field) as $f)
+				    $tmp = $tmp[$f];
+				return $tmp;
+			}
+			else if(is_object($data))
+			{
+				if(strpos($field,'.')===false)  // simple field
+				{
+					if(method_exists($data, 'get'.$field))
+						return call_user_func(array($data,'get'.$field));
+					else
+						return $data->{$field};
+				}
+				else // field in the format of xxx.yyy.zzz
+				{
+					$object=$data;
+					foreach(explode('.',$field) as $f)
+						$object = TDataFieldAccessor::getDataFieldValue($object, $f);
+					return $object;
+				}
+			}
+		}
+		catch(Exception $e)
+		{
+			throw new TInvalidDataValueException('datafieldaccessor_datafield_invalid',$field,$e->getMessage());
+		}
+		throw new TInvalidDataValueException('datafieldaccessor_data_invalid',$field);
+	}
+}