笨方法的combox级联

private void SuckRegion_SelectionChanged(object sender, SelectionChangedEventArgs e)
{
//var para = ViewModelHelper.SampArmMainWindowViewModel.SampArmParaInfor;
//if (para.SelectSuckRegionIndex == 0)
//{
// SuckPos.ItemsSource = PBC20_SysList.Reag2PosList;
//}
//else if (para.SelectSuckRegionIndex == 1)
//{
// SuckPos.ItemsSource = PBC20_SysList.SampPosList;
//}
//SuckPos.SelectedIndex = 0;

}