partial void swListen(NSObject sender)
        {
            if (device != null)
            {
                if (((UISwitch)sender).On)
                {
                    device.Listen();
                }
                else
                {
                    device.Unlisten();
                }
            }

            Console.WriteLine("listen: " + ((UISwitch)sender).On);
        }
        void SetupOptions()
        {
            muted.ValueChanged += (sender, e) => {
                if (connection != null && connection.State == TCConnectionState.Connected)
                {
                    connection.Muted = muted.Value;
                }
            };

            listening.ValueChanged += (sender, e) => {
                if (device != null)
                {
                    if (listening.Value)
                    {
                        device.Listen();
                    }
                    else
                    {
                        device.Unlisten();
                    }
                }
            };
        }