aistudio-wpf-diagram/Others/Fluent.Ribbon/Fluent.Ribbon.Showcase/ViewModels/ViewModel.cs

namespace FluentTest.ViewModels
{
    using System.ComponentModel;
    using System.Runtime.CompilerServices;
    using JetBrains.Annotations;

    public class ViewModel : INotifyPropertyChanged
    {
        public event PropertyChangedEventHandler PropertyChanged;

        [NotifyPropertyChangedInvocator]
        protected void OnPropertyChanged([CallerMemberName] string propertyName = null)
        {
            this.PropertyChanged?.Invoke(this, new PropertyChangedEventArgs(propertyName));
        }
    }
}