private function _validateValuesArrayArgument(array $values)
	{
		foreach($values as $value)
		{
			if(!in_array($value, $this->allowedOptions))
			{
				$msg = 'Invalid element in $value array: "' . $value . '", allowed values: ' . implode(', ',
				                                                                                       $this->allowedOptions);

				$this->_optionValueException($msg);
			}
		}
	}