[quote user="Robert Hook"]use: Bentley.DgnPlatformNET.ElementAgendaDisplayable[/quote]
Thanks for that tip! Since it's an undocumented class I don't suppose I would have found it. FWIW, here's the code that highlights an element from outside a state function...
private void HighlightElement (Element el) { ElementAgendaDisplayable agenda = new ElementAgendaDisplayable(); agenda.Insert(el, true); agenda.Hilite(); }