Добавьте файлы проекта.

Windows/FoundPropWindow.xaml.cs

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+using System;
+using System.Collections.Generic;
+using System.Linq;
+using System.Text;
+using System.Threading.Tasks;
+using System.Windows;
+using System.Windows.Controls;
+using System.Windows.Data;
+using System.Windows.Documents;
+using System.Windows.Input;
+using System.Windows.Media;
+using System.Windows.Media.Imaging;
+using System.Windows.Shapes;
+
+namespace GroundOrganizer
+{
+    /// <summary>
+    /// Логика взаимодействия для FoundPropWindow.xaml
+    /// </summary>
+    public partial class FoundPropWindow : Window
+    {
+        ViewModel vm;
+        public FoundPropWindow()
+        {
+            InitializeComponent();
+            DataContext = App.Current.MainWindow.DataContext;
+            vm = DataContext as ViewModel;
+        }
+
+        private void ButtonOK_Click(object sender, RoutedEventArgs e)
+        {
+            vm.SelectedFoundation.CopyProps(vm.BufferFoundations);
+            vm.UpdateFoundationInList();
+            vm.UpdateFoundLoadInList();
+            this.Close();
+        }
+
+        private void ButtonCancel_Click(object sender, RoutedEventArgs e)
+        {
+            this.Close();
+        }
+    }
+}