Hi, sorry for the late response. I found the class I was thinking about, it's spark.core.SpriteVisualElement. It's not as small as I hoped, but it's way much smaller then UIComponent, and it's possible to use it as a base class for Flex components, so, it may be a good target for a PoC. It has an added value of a class that potentially can host FXG graphics, not sure what it gives us though... The class is about 3K loc big + has some dependencies, however, the dependencies should be easy to bootstrap, for example the dependency to IUIComponent is through some IUIComponent-specific add-child routine, which can be removed entirely with no harm to the component (as it's not going to be used in connection to UIComponent for the test purposes anyway).
Best. Oleg
