'MementoCommand<int>' is obsolete: 'This class will be obsolete, use ICommand with Memento instead'

'MOriginator<int>' is obsolete: 'This class will be obsolete, use ICommand instead'

Cannot convert null literal to non-nullable reference type.

'MOriginator<VoicerMeta>' is obsolete: 'This class will be obsolete, use ICommand instead'

'MementoCommand<VoicerMeta>' is obsolete: 'This class will be obsolete, use ICommand with Memento instead'

'VoicerSelector.PropertyChanged' hides inherited member 'ReactiveObject.PropertyChanged'. Use the new keyword if hiding was intended.

Nullability of reference types in type of 'event PropertyChangedEventHandler VoicerSelector.PropertyChanged' doesn't match implicitly implemented member 'event PropertyChangedEventHandler? INotifyPropertyChanged.PropertyChanged'.

'Voicer.PropertyChanged' hides inherited member 'ReactiveObject.PropertyChanged'. Use the new keyword if hiding was intended.

'MTextBoxEditor.PropertyChanged' hides inherited member 'ReactiveObject.PropertyChanged'. Use the new keyword if hiding was intended.