AddEdit.cs

using DevExpress.Xpf.Mvvm;
using MMHLive.Helpers;
using System;
using System.Collections.Generic;
using System.Collections.ObjectModel;
using System.Linq;
using System.Text;
using System.Threading.Tasks;
using System.Windows.Controls;

namespace MMHLive.ViewModels
{
    public class AddContainerVM : NavigationViewModelBase
    {
        private ObservableCollection<UserControl> views = new ObservableCollection<UserControl>();
        public ObservableCollection<UserControl> Views
        {
            get { return views; }
            set
            {
                views = value;
                RaisePropertyChanged(() => Views);
            }
        }
        private UserControl currentView = new UserControl();

        public UserControl CurrentView
        {
            get
            {
                return currentView;
            }
            set
            {
                if((currentView as IAdd) != null)
                    (currentView as IAdd).IsSelected = false;
                currentView = value;
                (currentView as IAdd).IsSelected = true;
                RaisePropertyChanged(() => CurrentView);
                RaisePropertyChanged(() => States);
            }
        }

        public ObservableCollection<IAdd> States
        {
            get
            {
                return new ObservableCollection<IAdd>(Views.Select(v =>
                {
                    var temp = (v as IAdd);
                    return new Add(){ Attempted = temp.Attempted, Field = temp.Field, IsSelected = temp.IsSelected, IsValid = temp.IsValid, Value = temp.Value };
                }));
            }
        }

        public AddContainerVM(ObservableCollection<UserControl> _views)
        {
            Views = _views;
            CurrentView = Views.First();
        }
    }
}