SelectionToMXMLClipboard is an mxml extractor using Adobe Fireworks.
Drop the .jsf or .swf file into the Commands (or Command Panels) folder then run the command or if you have a mxp file, double-click the mxp and installation is automatic.
Fireworks and Flex
Create a vector object in Adobe Fireworks,
Then select the portion you want to translate into mxml,
Run the command Commands > UIGFx > SelectionToMXMLClipboard,
The mxml code is copied into the clipboard and paste it into your skinClass in Flex.
This first version allows you to export Rectangle, Paths and Groups with the following properties: SolidColor / SolidColorStroke, LinearGradient ou RadialGradient, and even some filters : Blur / DropShadow / InnerShadow.