first edit

XLIMS.CORE/ViewModels/MainViewModel.cs

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+using Microsoft.EntityFrameworkCore.ChangeTracking;
+using Microsoft.Extensions.DependencyInjection;
+using System;
+using System.Collections.Generic;
+using System.Collections.ObjectModel;
+using System.Text;
+using System.Windows;
+using System.Windows.Input;
+using XLIMS.CONTRACT;
+using XLIMS.CORE.Windows;
+using XLIMS.MVVM.Base;
+
+namespace XLIMS.CORE.ViewModels
+{
+    public class MainViewModel:ViewModelBase
+    {
+        #region Constructor
+        public MainViewModel(IServiceProvider serviceProvider) 
+        {
+            _serviceProvider = serviceProvider;
+
+            // Регистрация доступных activities
+            Activities.Add(serviceProvider.GetRequiredService<XLIMS.PSV.ViewModels.MainViewModel>());
+            Activities.Add(serviceProvider.GetRequiredService<XLIMS.DEV.ViewModels.MainViewModel>());
+            Activities.Add(serviceProvider.GetRequiredService<XLIMS.SP.ViewModels.MainViewModel>());
+            Activities.Add(serviceProvider.GetRequiredService<XLIMS.TPRZ.ViewModels.MainViewModel>());
+
+            // По умолчанию открываем первую
+            CurrentActivity = Activities.FirstOrDefault();
+
+            NavigateCommand = new RelayCommand<IActivityViewModel>(Navigate);
+        }
+        #endregion //Constructor
+
+        #region Events
+        #endregion //Events
+
+        #region Fields
+        public readonly IServiceProvider _serviceProvider;
+        #endregion //Fields
+
+        #region Properties
+        public ObservableCollection<IActivityViewModel> Activities { get; }
+            = new ObservableCollection<IActivityViewModel>();
+
+        private IActivityViewModel _currentActivity;
+        public IActivityViewModel CurrentActivity
+        {
+            get => _currentActivity;
+            set
+            {
+                if (_currentActivity != value)
+                {
+                    _currentActivity = value;
+                    OnPropertyChanged();
+                }
+            }
+        }
+        #endregion //Properties
+
+        #region Methods
+        private void Navigate(IActivityViewModel vm)
+        {
+            if (vm != null)
+                CurrentActivity = vm;
+        }
+        #endregion //Methods
+
+        #region Commands
+        public ICommand NavigateCommand { get; }
+        #endregion //Commands
+    }
+}