I'm saying it's a bug because I think it should work differently to what is happening in my application.
I was trying to create a background image from a Flash MovieClip asset for a Flex UI component (for arguments sake I am using a VBox in this example) and could simply not get the slice-9 grid that I had defined in Flash be picked up in Flex.

I'm using the Flex 3.2 SDK and the only way to get my graphic to scale as expected was to use the original PNG. Anything I tried via the SWF asset would not work, including defining the scale 9 grid in CSS in Flex.

Here's my example app (I used one of Arals' tutorials as a basis). Please view source on my app and tell me why this isn't working, because I do not understand it. What am I missing?