public ShellViewModel(LoginViewModel loginVM, MenuViewModel menuVM, ViewNavigator viewNawigator)
{
_loginVM = loginVM;
_menuVM = menuVM;
_viewNavigator = viewNawigator;
_viewNavigator.SetNavigator(Navigate);
_viewNavigator.AddDirections(Direction.LogIn, _loginVM);
_viewNavigator.AddDirections(Direction.Menu, _menuVM);
Navigate(_loginVM);
}