Hi Glen,
if i can give you an advice, to develop the same widget of FV in a custom app it's a bit difficult. But took as example the searcgwidget for not FV by Robert S. that you can download on code gallery. you ought to develop a new AS class in flex that extend the TitleWindow class "spark.components.TitleWindow" Flex, and after you ought to develop the mxml skin of this component.
I worked in this way and the result of work it's good.
All people with more experience and all developers of ESRI can tall me if i made wrong
Bye