edit

XLAB2/SpoiEditWindow.xaml.cs

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+using System.Windows;
+
+namespace XLAB2
+{
+    public partial class SpoiEditWindow : Window
+    {
+        internal SpoiEditWindow(SpoiEditWindowViewModel viewModel)
+        {
+            InitializeComponent();
+            DataContext = viewModel;
+            viewModel.CloseRequested += ViewModelOnCloseRequested;
+        }
+
+        private void ViewModelOnCloseRequested(object sender, bool? dialogResult)
+        {
+            DialogResult = dialogResult;
+            Close();
+        }
+    }
+}