How to Navigate to Detail View from a List View. about mui HOT 1 OPEN

    <mui:ModernFrame
        ContentLoader="{Binding Path=FigurePieContentLoader}"
        Source="{Binding Path=ChartFigure, Converter={StaticResource ResourceKey=uriCnv}}" />

    public ViewModel()
    {
		// the ViweModel's ctor	
        // a  different initialization code...
        // ...
        
        // the update chart command
        this.UpdateChartCommand = new RelayCommand<PermutationTreeNode<string>>(UpdateChart);
    }

    private PermutationTreeNode<string> chartFigure;
    public PermutationTreeNode<string> ChartFigure
    {
        get => chartFigure;
        set => Set(ref chartFigure, value, nameof(ChartFigure));
    }

    private FigurePieContentLoader figurePieContentLoader = new FigurePieContentLoader();
    public FigurePieContentLoader FigurePieContentLoader => this.figurePieContentLoader;


    private void UpdateChart(PermutationTreeNode<string> node)
    {
			// a code to determine the primNode .......
            if (primNode != this.chartFigure)
            {
                this.FigurePieContentLoader.ChartFigure = primNode;
                this.ChartFigure = primNode;                            // leads to refresh the pie chart
            }
        }
    }

public class FigurePieContentLoader : DefaultContentLoader
{
    public PermutationTreeNode<string> ChartFigure { get; set; }

    protected override object LoadContent(Uri uri)
    {
        if (this.ChartFigure == null) return new DefaultPie();
        var view = new FigurePie() { DataContext = this.ChartFigure };
        return view;
    }
}

public class UriConverter : IValueConverter
{
    public object Convert(object value, Type targetType, object parameter, System.Globalization.CultureInfo culture)
    {

        string str = null;
        if (value == null)
        {
            str = "null";
        }
        else if (value is string valStr)
        {
            str = valStr;
        }
        else if (value is int valInt)
        {
            str = valInt.ToString();
        }
        else
        {
            str = value.GetHashCode().ToString();
        }
        return new Uri(str, UriKind.Relative);
    }

    public object ConvertBack(object value, Type targetType, object parameter, System.Globalization.CultureInfo culture)
    {
        throw new NotSupportedException("UriConverter Convert Back is not supported!");
    }