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