private void AddKey_Click(object sender, RoutedEventArgs e)
        {
            AddKeyWindow window = new AddKeyWindow(context.SelectedFile);

            window.AddHandler(AddKeyWindow.AcceptEvent, new RoutedEventHandler(AddKey));
            window.Show();
        }
        private void AddKey(object sender, RoutedEventArgs e)
        {
            AddKeyWindow requestWindow = sender as AddKeyWindow;

            //encrypt input key value before insert in db
            requestWindow.Key.KeyValue = KeyEncryptor.Encrypt(requestWindow.Key.KeyValue);

            fileService.AddKey(requestWindow.Key);
            requestWindow.Close();
        }