Adding point works

Views/MainWindow.axaml.cs

@@ -1,4 +1,7 @@
 using Avalonia.Controls;
+using GazpromApp.Messages;
+using GazpromApp.ViewModels;
+using CommunityToolkit.Mvvm.Messaging;
 
 namespace GazpromApp.Views;
 
@@ -7,5 +10,25 @@ public partial class MainWindow : Window
     public MainWindow()
     {
         InitializeComponent();
+
+        if (Design.IsDesignMode)
+            return;
+
+        WeakReferenceMessenger.Default.Register<MainWindow, NewPointMessage>(this, static (w, m) =>
+        {
+            NewPointDialog dialog = new NewPointDialog()
+            {
+                DataContext = new NewPointDialogViewModel()
+            };
+            m.Reply(dialog.ShowDialog<PointViewModel?>(w));
+        });
+        WeakReferenceMessenger.Default.Register<MainWindow, EditPointMessage>(this, static (w, m) =>
+        {
+            EditPointDialog dialog = new EditPointDialog()
+            {
+                DataContext = new EditPointDialogViewModel()
+            };
+            m.Reply(dialog.ShowDialog<PointViewModel?>(w));
+        });
     }
 }