public function setPosition($left, $top)
    {
        $params = [
            'x' => intval($left),
            'y' => intval($top)
        ];
        $command = $this->driver->factoryCommand(
            'window/' . $this->windowHandle . '/position',
            WebDriver_Command::METHOD_POST,
            $params
        );
        return $this->driver->curl($command)['value'];
    }