class AWS::EC2::VPC

def internet_gateway= internet_gateway
  # remove currently attached internet gateway
  gateway = self.internet_gateway
  gateway.detach(self) if gateway
  if internet_gateway
    unless internet_gateway.is_a?(InternetGateway)
      internet_gateway = InternetGateway.new(internet_gateway,
        :config => config)
    end
    internet_gateway.attach(self)
  end
end