NotificationConfigurationViewModel.cs

namespace DynamicDataGroupingSample
{
    public class NotificationConfigurationViewModel : ReactiveObjectEx 
    {
        public NotificationConfigurationViewModel()
        {
            ...
            
            var smsChannelChangedCommand = ReactiveCommand.CreateFromTask<NotificationConfiguration>(OnSmsChannelChanged);
            var emailChannelChangedCommand = ReactiveCommand.CreateFromTask<NotificationConfiguration>(OnEmailChannelChanged);
            var pushNotificationChannelChangedCommand = ReactiveCommand.CreateFromTask<NotificationConfiguration>(OnPushNotificationChannelChanged);
            var phoneChannelChangedCommand = ReactiveCommand.CreateFromTask<NotificationConfiguration>(OnPhoneChannelChanged);

            notificationConfigurationItemChanges
                        .WhenPropertyChanged(x => x.SmsChannel , notifyOnInitialValue: false)
                        .Throttle(TimeSpan.FromMilliseconds(SelectionDueMilliseconds), RxApp.TaskpoolScheduler)
                        .Select(x => x.Sender)
                        .InvokeCommand(smsChannelChangedCommand)
                        .DisposeWith(Subscriptions);

            notificationConfigurationItemChanges
                        .WhenPropertyChanged(x => x.EmailChannel, notifyOnInitialValue: false)
                        .Throttle(TimeSpan.FromMilliseconds(SelectionDueMilliseconds), RxApp.TaskpoolScheduler)
                        .Select(x => x.Sender)
                        .InvokeCommand(emailChannelChangedCommand)
                        .DisposeWith(Subscriptions);

            notificationConfigurationItemChanges
                        .WhenPropertyChanged(x => x.PushNotificationChannel, notifyOnInitialValue: false)
                        .Throttle(TimeSpan.FromMilliseconds(SelectionDueMilliseconds), RxApp.TaskpoolScheduler)
                        .Select(x => x.Sender)
                        .InvokeCommand(pushNotificationChannelChangedCommand)
                        .DisposeWith(Subscriptions);

            notificationConfigurationItemChanges
                      .WhenPropertyChanged(x => x.PhoneChannel, notifyOnInitialValue: false)
                      .Throttle(TimeSpan.FromMilliseconds(SelectionDueMilliseconds), RxApp.TaskpoolScheduler)
                      .Select(x => x.Sender)
                      .InvokeCommand(phoneChannelChangedCommand)
                      .DisposeWith(Subscriptions);
        }

        private Task OnPhoneChannelChanged(NotificationConfiguration notificationConfiguration)
        {
            System.Diagnostics.Debug.WriteLine($"Phone Channel - Changed - {notificationConfiguration.GroupName}.{notificationConfiguration.Name} - {notificationConfiguration.PhoneChannel}");

            return Task.CompletedTask;
        }

        private Task OnPushNotificationChannelChanged(NotificationConfiguration notificationConfiguration)
        {
            System.Diagnostics.Debug.WriteLine($"Push Notification Channel - Changed - {notificationConfiguration.GroupName}.{notificationConfiguration.Name} - {notificationConfiguration.PushNotificationChannel}");

            return Task.CompletedTask;
        }

        private Task OnEmailChannelChanged(NotificationConfiguration notificationConfiguration)
        {
            System.Diagnostics.Debug.WriteLine($"Email Notification Channel - Changed - {notificationConfiguration.GroupName}.{notificationConfiguration.Name} - {notificationConfiguration.EmailChannel}");

            return Task.CompletedTask;
        }

        private Task OnSmsChannelChanged(NotificationConfiguration notificationConfiguration)
        {
            System.Diagnostics.Debug.WriteLine($"SMS Notification Channel - Changed - {notificationConfiguration.GroupName}.{notificationConfiguration.Name} - {notificationConfiguration.SmsChannel}");

            return Task.CompletedTask;
        }
        private const int SelectionDueMilliseconds = 250;
    }
}