Flex 4 lacks the default-background-color compiler option?

Hello,
started converting my Flex 3 applications to Flex 4 and noticed that Flex 4 lacks the default-background-color compiler option.
Flex 3 has it: http://livedocs.adobe.com/flex/3/html/help.html?content=compilers_14.html
Flex 4 doesn't: http://help.adobe.com/en_US/flex/using/WS2db454920e96a9e51e63e3d11c0bf69084-7a92.html
This raises a question: how am I supposed to keep my background from flashing from grey to white when the RIA is loaded? Is it possible to use preloader with background set to whatever color I like to see? Any easier solutions?
Best regards,
Jukka

This works for me:
@namespace mx "library://ns.adobe.com/flex/mx";
mx|Application{
     background-color:#ffffff;
Of course if you have changed the Application element to spark equivalent, you have to change the namespace.
Regards,
Jukka

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