private void btnLichBieuDinhKy_Click(object sender, RoutedEventArgs e) { if (ucLichBieuDinhKy == null) { ucLichBieuDinhKy = new UserControlLibrary.UCLichBieuDinhKy(mTransit); } spNoiDung.Children.Clear(); ucLichBieuDinhKy.Height = spNoiDung.ActualHeight; ucLichBieuDinhKy.Width = spNoiDung.ActualWidth; spNoiDung.Children.Add(ucLichBieuDinhKy); }