Modifying points works

Views/MainWindow.axaml.cs

@@ -22,11 +22,12 @@ public partial class MainWindow : Window
             };
             m.Reply(dialog.ShowDialog<PointViewModel?>(w));
         });
+        
         WeakReferenceMessenger.Default.Register<MainWindow, EditPointMessage>(this, static (w, m) =>
         {
             EditPointDialog dialog = new EditPointDialog()
             {
-                DataContext = new EditPointDialogViewModel()
+                DataContext = new EditPointDialogViewModel(m.Point)
             };
             m.Reply(dialog.ShowDialog<PointViewModel?>(w));
         });