private void BtnAddRow_Click(object sender, RoutedEventArgs e) { var dialog = new Controls.PromptDialog() { Title = "Enter row name" }; if (dialog.ShowDialog() == true) { if (string.IsNullOrEmpty(dialog.ResponseText)) { MessageBox.Show("Failed to add empty name", "Failed", MessageBoxButton.OK, MessageBoxImage.Error); return; } GR.AddRow(dialog.ResponseText[0]); } }