OK. I have found it:
To do that in FB, you need to go to the Properties of the project, select ActionScript Compiler and make it to use 10.1.0 for the Flash Player... The default is set to 10.0.0, so just change it to 10.1.0 and you should be able to import flash.globalization package...
source: http://www.actionscript.org/forums/showthread.php3?t=250709&page=2