edit

XLAB2/SpnmtpDirectoryWindow.xaml.cs

@@ -1,4 +1,6 @@
 using System.Windows;
+using System.Windows.Controls;
+using System.Windows.Input;
 
 namespace XLAB2
 {
@@ -13,6 +15,16 @@ namespace XLAB2
             DataContext = _viewModel;
         }
 
+        private void DataGridRow_PreviewMouseRightButtonDown(object sender, MouseButtonEventArgs e)
+        {
+            var row = sender as DataGridRow;
+            if (row != null)
+            {
+                row.IsSelected = true;
+                row.Focus();
+            }
+        }
+
         private async void Window_Loaded(object sender, RoutedEventArgs e)
         {
             await _viewModel.InitializeAsync();