Axis problem OxyPlot

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WPF

C#3.5

I have strange problem with coordinates transformation. Why after axis changing all transformation of old coordinates for example
"rectangle.MaximumX = XAxis.InverseTransform(XAxis.Transform(this.MyMemento._rectangle.MaximumX));"

Is NaN? Without axis changing all is ok.

namespace OxyRectangle
{
    /// <summary>
    /// Interaction logic for MainWindow.xaml
    /// </summary>
    public partial class MainWindow : Window
    {
        public MainWindow()
        {
            InitializeComponent();
            this.DataContext = new RectangleScale();
        }
    }
    public class RectangleScale
    {
        public PlotModel PlotModel { get; set; }
        RectangleAnnotation Rectum;
        private LinearAxis XAxis;
        private LinearAxis YAxis;
        public Memento MyMemento { get; set; }
        public RectangleScale()
        {
            PlotModel = new PlotModel();
            XAxis = new LinearAxis
            {
                Position = AxisPosition.Bottom
            };
            YAxis = new LinearAxis
            {
                Position= AxisPosition.Left,
                IsPanEnabled=false
            };
            Rectum = new RectangleAnnotation();
            SetRectum(Rectum, 1, 1, 10, 10);
            MyMemento = new Memento(Rectum);
            PlotModel.Axes.Add(XAxis);
            PlotModel.Axes.Add(YAxis);
            PlotModel.Annotations.Add(Rectum);
            ChangeAxis(PlotModel, 100, 200);
            ConvertOldRectangle(Rectum);
            PlotModel.InvalidatePlot(true);
        }
        public void SetRectum(RectangleAnnotation rectangle, double xmin, double ymin, double xmax, double ymax)
        {
            rectangle.MinimumX = xmin;
            rectangle.MinimumY = ymin;
            rectangle.MaximumX = xmax;
            rectangle.MaximumY = ymax;
        }
        public void ChangeAxis(PlotModel _plotmodel,int minimum,int maximum)
        {
            _plotmodel.Axes.Clear();
            LinearAxis XAxis = new LinearAxis
            {
                Position = AxisPosition.Bottom,
                Minimum=minimum,
                Maximum=maximum
            };
            LinearAxis YAxis = new LinearAxis
            {
                Position = AxisPosition.Left,
                Minimum=minimum,
                Maximum=maximum,
                IsPanEnabled = false
            };
            _plotmodel.Axes.Add(XAxis);
            _plotmodel.Axes.Add(YAxis);
            _plotmodel.InvalidatePlot(true);
        }
        public void ConvertOldRectangle(RectangleAnnotation _rectangle)
        {
            _rectangle.MaximumX = XAxis.InverseTransform(XAxis.Transform(this.MyMemento._rectangle.MaximumX));
            _rectangle.MinimumX = XAxis.InverseTransform(XAxis.Transform(this.MyMemento._rectangle.MinimumX));
            _rectangle.MaximumY = YAxis.InverseTransform(XAxis.Transform(this.MyMemento._rectangle.MaximumY));
            _rectangle.MinimumY = YAxis.InverseTransform(XAxis.Transform(this.MyMemento._rectangle.MinimumY));
        }
        public void Revert()
        {
            Rectum = this.MyMemento._rectangle;
        }
    }
    public class Memento
    {
        public readonly RectangleAnnotation _rectangle;
        public Memento(RectangleAnnotation rectangle)
        {
            _rectangle = rectangle;
        }
    }
}