Navigation data on 3rd party items control

[xperiandri]

      <sfTreeGrid:SfTreeGrid ItemsSource="{x:Bind ViewModel.BuildingsAndComplexes, Mode=OneWay}"
                             uen:Navigation.Request="Building"
                             AllowDraggingColumns="True"
                             AllowResizingColumns="True"
                             AllowSorting="True"
                             AutoGenerateColumns="False"
                             ChildPropertyName="Buildings">

When I navigate from an item to a page data is null, why?
How can I pass the clicked item (its DataContext) as the data?

As I see in docs https://platform.uno/docs/articles/external/uno.extensions/doc/Learn/Navigation/HowTo-NavigateInXAML.html#3-navigating-to-selecteditem data must be filled.
Looks like it happens because SfTreeGrid has some specifics.
@nickrandolph what do I need to implement so that SfTreeGrid pass the data too?

[xperiandri]

Specific IRequestHandler is required

MUST BE ADDED TO DI HERE

.UseNavigation(ReactiveViewModelMappings.ViewModelMappings, RegisterRoutes, configureServices: (context, services) => services
    .AddSingleton<IRequestHandler, SfDataGridRequestHandler>()
    .AddSingleton<IRequestHandler, SfTreeGridRequestHandler>()
)

using Syncfusion.UI.Xaml.DataGrid;

/// <summary>
/// Navigation request handler for <see cref="SfDataGrid"/> controls.
/// </summary>
/// <param name="HandlerLogger">Logger for logging</param>
public record SfDataGridRequestHandler(ILogger<SfDataGridRequestHandler> HandlerLogger) : ControlRequestHandlerBase<SfDataGrid>(HandlerLogger)
{
    /// <inheritdoc/>
    public override IRequestBinding? Bind(FrameworkElement view)
    {
        var viewToBind = view;
        var dataGrid = view as SfDataGrid;
        if (dataGrid is null)
        {
            if (Logger.IsEnabled(LogLevel.Warning))
            {
                Logger.LogWarningMessage($"Bind: {view?.GetType()} is not a SfDataGrid");
            }
            return default;
        }

        async Task Action(FrameworkElement sender, object data)
        {
            var navdata = sender.GetData() ?? data;
            var path = sender.GetRequest();
            var nav = sender.Navigator();
            if (nav is null || navdata is null)
            {
                return;
            }

            await nav.NavigateRouteAsync(sender, path, Qualifiers.None, navdata);
        }

        async void TapAction(object? actionSender, GridCellDoubleTappedEventArgs actionArgs)
        {
            var sender = actionSender as SfDataGrid;
            if (!(sender?.IsDoubleTapEnabled ?? false))
            {
                return;
            }
            var data = sender.GetData() ?? actionArgs.Record;

            await Action(sender, data);
        }

        Action? connect = () => dataGrid.CellDoubleTapped += TapAction;
        Action? disconnect = () => dataGrid.CellDoubleTapped -= TapAction;

        if (dataGrid.IsLoaded)
        {
            connect();
        }

        void LoadedHandler(object s, RoutedEventArgs e) => connect();
        dataGrid.Loaded += LoadedHandler;

        void UnloadedHandler(object s, RoutedEventArgs e) => disconnect();
        dataGrid.Unloaded += UnloadedHandler;

        return new RequestBinding(viewToBind, LoadedHandler, UnloadedHandler);
    }
}

using Syncfusion.UI.Xaml.TreeGrid;

/// <summary>
/// Navigation request handler for <see cref="SfTreeGrid"/> controls.
/// </summary>
/// <param name="HandlerLogger">Logger for logging</param>
public record SfTreeGridRequestHandler(ILogger<SfTreeGridRequestHandler> HandlerLogger) : ControlRequestHandlerBase<SfTreeGrid>(HandlerLogger)
{
    /// <inheritdoc/>
    public override IRequestBinding? Bind(FrameworkElement view)
    {
        var viewToBind = view;
        var treeGrid = view as SfTreeGrid;
        if (treeGrid is null)
        {
            if (Logger.IsEnabled(LogLevel.Warning))
            {
                Logger.LogWarningMessage($"Bind: {view?.GetType()} is not a Selector");
            }
            return default;
        }

        async Task Action(FrameworkElement sender, object data)
        {
            var navdata = sender.GetData() ?? data;
            var path = sender.GetRequest();
            var nav = sender.Navigator();
            if (nav is null || navdata is null)
            {
                return;
            }

            await nav.NavigateRouteAsync(sender, path, Qualifiers.None, navdata);
        }

        async void TapAction(object? actionSender, TreeGridCellDoubleTappedEventArgs actionArgs)
        {
            var sender = actionSender as SfTreeGrid;
            if (!(sender?.IsDoubleTapEnabled ?? false))
            {
                return;
            }
            var data = sender.GetData() ?? actionArgs.Record;

            await Action(sender, data);
        }

        Action? connect = () => treeGrid.CellDoubleTapped += TapAction;
        Action? disconnect = () => treeGrid.CellDoubleTapped -= TapAction;

        if (treeGrid.IsLoaded)
        {
            connect();
        }

        void LoadedHandler(object s, RoutedEventArgs e) => connect();
        treeGrid.Loaded += LoadedHandler;

        void UnloadedHandler(object s, RoutedEventArgs e) => disconnect();
        treeGrid.Unloaded += UnloadedHandler;

        return new RequestBinding(viewToBind, LoadedHandler, UnloadedHandler);
    }
}