Probably the most common hack I've had to perpetrate in Flex 4 has had do with creating backgrounds for groups. Obviously Adobe wanted to keep the Group class lightweight, but denying fill/stroke capabilities seems silly considering the graphics object is already there- we just need methods to access it.
Here's GraphicGroup- an extension of Group that exposes Stroke/Fill properties just like a Rect, and alternately exposes some convenient style properties. The same code can be added to HGroup and VGroup.
GraphicGroup.as
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