Adding equipment works

Views/NewEquipmentDialog.axaml.cs

@@ -0,0 +1,24 @@
+using System;
+using Avalonia.Controls;
+using CommunityToolkit.Mvvm.Messaging;
+using GazpromApp.Messages;
+
+namespace GazpromApp.Views;
+
+public partial class NewEquipmentDialog : Window
+{
+    public NewEquipmentDialog()
+    {
+        InitializeComponent();
+        
+        WeakReferenceMessenger.Default.Register<NewEquipmentDialog, NewEquipmentDone>(this, static (w, m) =>
+        {
+            w.Close(m.Equipment);
+        });
+    }
+
+    private void Window_OnClosed(object? sender, EventArgs e)
+    {
+        WeakReferenceMessenger.Default.Unregister<NewEquipmentDone>(this);
+    }
+}