IocKernel.cs

    public static class IocKernel
    {
        private static StandardKernel _kernel;
        private static int _sendingChainDepth;
        private static FormBase _latestViewModel;

        public static void SendTo<T>() where T: FormBase
        {
            if (_kernel == null)
                return;
            _sendingChainDepth++;
            T newViewModel = _kernel.Get<T>();
            if (_latestViewModel == null)
                _latestViewModel = newViewModel;
            _sendingChainDepth--;
            if (_sendingChainDepth != 0)
                return;
            Messenger.Default.Send(new SetMainViewModel { ViewModel = _latestViewModel });
            _latestViewModel = null;
        }
...

MainWindowViewModel.cs

namespace ThickClient.MainWindow
{
    using DevExpress.Mvvm;
    using PropertyChanged;
    using OnlineService.Login;
    using FirstInit;
    using Messages;

    [ImplementPropertyChanged]
    public class MainWindowViewModel: ViewModelBase
    {
        public FormBase CurrentPageViewModel { get; set; }

        public MainWindowViewModel()
        {
            if (IsInDesignMode)
            {
                LoginViewModelDTO dto = new LoginViewModelDTO
                {
                    DialogProvider = null,
                    OnlineServiceProvider = null,
                    DataModelsProvider = null
                };
                CurrentPageViewModel = new LoginViewModel(dto);
            }
            Messenger.Default.Register<SetMainViewModel>(this, SetViewModel);
            IocKernel.SendTo<FirstInitViewModel>();
        }

        private void SetViewModel(SetMainViewModel viewModel)
        {
            CurrentPageViewModel?.Free?.Invoke();
            CurrentPageViewModel = viewModel.ViewModel;
            viewModel.ViewModel.Init?.Invoke();
        }
    }
}