HtmlElement he = instance.GetTabByAddress("page").GetDocumentByAddress("0").FindElementByTag("form", 1).FindChildByAttribute("select", "fulltag", "select", "text", 2);
if (he.IsVoid) return -1;
instance.WaitFieldEmulationDelay();
he.SetValue("30", instance.EmulationLevel, false); // 30 будет соответствовать 1983