private void btnQuanLyKhu_Click(object sender, RoutedEventArgs e)
 {
     if (ucKhu == null)
     {
         ucKhu = new UserControlLibrary.UCKhu(mTransit);
     }
     spNoiDung.Children.Clear();
     spNoiDung.Children.Add(ucKhu);
 }
 private void btnQuanLyKhu_Click(object sender, RoutedEventArgs e)
 {
     if (ucKhu == null)
     {
         ucKhu = new UserControlLibrary.UCKhu(mTransit);
     }
     spNoiDung.Children.Clear();
     spNoiDung.Children.Add(ucKhu);
 }