public override void Invoke(AWSCredentials creds, RegionEndpoint region, int maxItems)
        {
            AmazonEC2Config config = new AmazonEC2Config();

            config.RegionEndpoint = region;
            ConfigureClient(config);
            AmazonEC2Client client = new AmazonEC2Client(creds, config);

            DescribeCustomerGatewaysResponse resp = new DescribeCustomerGatewaysResponse();
            DescribeCustomerGatewaysRequest  req  = new DescribeCustomerGatewaysRequest
            {
            };

            resp = client.DescribeCustomerGateways(req);
            CheckError(resp.HttpStatusCode, "200");

            foreach (var obj in resp.CustomerGateways)
            {
                AddObject(obj);
            }
        }