Hi!, my application change the displayed text of the appointment, with the IU Element creation filter and everything works fine. It also change the text with the all day event, but in these case it render the text with the original text length. I mean:

original text = "test" modified text = "123456789"
rendered text = "1234"

i use:
appointmentElement = Ctype(parent.Getancestor(GetType(AllDayEventUIElement)), AllDayEventUIElement)
appointment = appointmentElement.getContext(Gettype(Appoinment))
appointment.text = "123456789"

Thanks, Marcelo.