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Not sure what sdk you are using but I just tried your sample with the 3.5 sdk in Flashbuilder(don't have Flexbuilder installed so not sure what its default sdk is) and it worked fine, maybe this has been an issue that was fixed in an iteration of the sdk after the one you are using.
I am using SDK 3.2 and and compiling with flash 10
Thanks for the help.
I upgraded to 3.5 and this seems to have solved the problem.