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())
    {
      var obj = layer.DrawText(new DlxPoint(100,100), "Hello, World.\nHello, World.\n");

      var dlg = new DlxDialog(400, 110, "Line spacing");
      if (dlg.IsValid())
      {
        dlg.AddStaticText(10, 33, 70, "Spacing: ");
        var ctrl_cbl = dlg.AddComboBox(90, 30, 300);
        ctrl_cbl.AddString("1", 1, obj.GetLineSpacing()==1);
        ctrl_cbl.AddString("1.5", 1.5, obj.GetLineSpacing()==1.5);
        ctrl_cbl.AddString("2", 2, obj.GetLineSpacing()==2);
        dlg.AddOkButton(280, 70, 50, 25);
        dlg.AddCancelButton(340, 70, 50, 25);
        if (dlg.DoModal())
        {
          obj.SetLineSpacing(ctrl_cbl.GetNumber());
        }
      }
    }
  }
}