protected BottomNavigationComponentBase(TViewModel viewModel, FragmentManager fragmentManager)
        {
            _viewModel = viewModel;

            var config = new FrameNavigationConfig(fragmentManager, ContainerId);

            ToolbarComponent = new ToolbarComponent <TViewModel, TKey>(config);
        }
 protected virtual void HandleTabSelected(int index)
 {
     ToolbarComponent.TabSelected(_viewModel, index);
 }