public void RequestNavigate(MapItem item)
        {
            var viewType = item.GetViewType();

            if (viewType == null)
            {
                return;
            }
            if (_regionManager.Regions[ContentRegionName].ActiveViews.FirstOrDefault()?.GetType() == viewType)
            {
                return;
            }
            if (!_container.IsRegistered <object>(viewType.FullName))
            {
                _container.RegisterSingleton(typeof(object), viewType, viewType.FullName);
            }
            _regionManager.Regions[ContentRegionName].RequestNavigate(viewType.FullName, item.GetNavigationParameters());
        }