private async void LifxClient_DeviceDiscovered(object sender, LifxClient.DeviceDiscoveryEventArgs e)
        {
            await this.Dispatcher.RunAsync(CoreDispatcherPriority.Normal, () =>
            {
                if (e.Device is LightBulb bulb)
                {
                    LifxItem lifxBulb = new LifxItem(this.LifxClient, bulb);

                    if (!this.Items.Contains(lifxBulb))
                    {
                        this.Items.Add(lifxBulb);
                    }
                }
            });
        }
        private async void LifxClient_DeviceLost(object sender, LifxClient.DeviceDiscoveryEventArgs e)
        {
            await this.Dispatcher.RunAsync(CoreDispatcherPriority.Normal, () =>
            {
                if (e.Device is LightBulb bulb)
                {
                    LifxItem item = this.Items.Where(t => t.HostName == bulb.HostName).SingleOrDefault();

                    if (item != null)
                    {
                        item.Dispose();
                        this.Items.Remove(item);
                    }
                }
            });
        }