var prj = DlxApp.GetJob().GetProject("Example Sch");
if (!prj.IsValid())
  prj = DlxApp.GetJob().NewProject("Example Sch");
var doc = prj.GetDocument("Examples Sch", DlxApp.DOCTYPE_SCHEMATIC);
if (!doc.IsValid())
{
  doc = prj.NewDocument("Examples Sch", DlxApp.DOCTYPE_SCHEMATIC);
  doc.SetPageFormat("A4", false);
}
if (doc.IsValid() && doc.Activate())
{
  var page = doc.GetActivePage();
  if (page.IsValid())
  {
    var layer = page.GetLayerFromType(DlxApp.LAYERTYPE_DRAWING);
    if (layer.IsValid())
    {
      // create objects
      var pen = new DlxPenStyle(0.5, new DlxColor("orangered"), "SOLID");
      doc.SetStyle(pen);
      var obj1 = layer.DrawLine(new DlxPoint(30, 30), new DlxPoint(80, 80));
      var obj2 = layer.DrawEllipse(new DlxPoint(80, 80), 10);
      // group the objects
      var selection = page.GetSelection();
      selection.Empty();
      selection.AddObject(obj1);
      selection.AddObject(obj2);
      var g = selection.Group("Line and Circle");
      // list childs
      var i = g.GetFrontObjectIterator();
      while (i.IsValid())
      {
        DlxApp.Printf("%s", g.GetNextObject(i).GetTypeName());
      }
    }
  }
}