from http://code.google.com/p/fxspy/
Check it out a live at: http://www.mieuxcoder.com/data/2007/12/FlexSpy-1.2/dashboard.html (in the application, click the flexSpy button on the top-right corner)
Flex-Spy allow you to inspect and dynamically change most properties and styles of the visual components in your Flex application. You can – for example – try out a specific width or a background color for your component before changing it in your code.
To install it in your application, follow the InstallationInstructions.
