RefPlanViewModel.cs

using System;
using System.Collections.Generic;
using System.Collections.ObjectModel;
using System.ComponentModel;
using System.Linq;
using System.Text;
using System.Threading.Tasks;

namespace DlgHypothesesGenerales
{
    class RefPlanViewModel
    {
        public event PropertyChangedEventHandler PropertyChanged;

        private void NotifyPropertyChanged(string name)
        {
            PropertyChanged?.Invoke(this, new PropertyChangedEventArgs(name));
        }

        private ObservableCollection<StringObject> _List = new ObservableCollection<StringObject>();
        public ObservableCollection<StringObject> List
        {
            get { return _List; }
            set
            {
                _List = value;
                NotifyPropertyChanged("List");
            }
        }

        public RefPlanViewModel()
        {
            List = new ObservableCollection<StringObject>
                {
                    new StringObject {Value = "AAA" },
                    new StringObject {Value = "AAA" },
                    new StringObject {Value = "AAA" },
                    new StringObject {Value = "AAA" },
                    new StringObject {Value = "AAA" },
                    new StringObject {Value = "AAA" },
                    new StringObject {Value = "AAA" },
                    new StringObject {Value = "AAA" },
                    new StringObject {Value = "AAA" },
                    new StringObject {Value = "AAA" },
                    new StringObject {Value = "AAA" },
                    new StringObject {Value = "AAA" },
                    new StringObject {Value = "AAA" },
                    new StringObject {Value = "AAA" }
                };
        }
    }

    public class StringObject
    {
        public string Value { get; set; }
    }
}