Hi Bjorn,
Thanks for the info. I can now show a time slider widget to switch the features on at the correct time - cool!
The problem is that they are not switching OFF at the correct time - my features have a Start and End time. In ArcMap, features are removed from the map when they are no longer active, but using the Flex Viewer with the Time Slider widget, they stay on the map at all times.
I experimented with the singlethumbastimeinstant option but either True or False returns the same result. Any clues?
Thanks,
Steve