public MainWindow()
        {
            InitializeComponent();
            viewModel = new ViewModels.Model();
            delPolygonUserControl = new CuttingDeleteInsidePolygon(viewModel);
            defineFishingNetUserControl = new DefineFishingNet(viewModel);
            defineFishingNetUserControl.onNavigation += defineFishingNetUserControl_onNavigation;
            defineFishingNetUserControl.onNotify += defineFishingNetUserControl_onNotify;
            this.Loaded += MainWindow_Loaded;
            Plot1.Model = viewModel.PlotModel;

        }
 public DefineFishingNet(Model viewModel):this()
 {
     this.viewModel = viewModel;
 }