Using FP10 classes within a FP9 wrapper in Flash Player 10

Hi,

We create Flash games which are embedded within third party wrapper SWF files, which are exported for FP9.

If I create an FP10 SWF which uses classes specific to FP10 (Pixel Bender classes such as Shader, ShaderData), when I run them in an FP9 wrapper within an FP10 player, an error is thrown
VerifyError: Error #1014: Class flash.display::Shader could not be found.

I thought this may be something to do with ApplicationDomains - maybe the child SWF was forced into using the global classes from the parent SWF, but assigning a new ApplicationDomain to the child didn’t make any difference.

Is there any way to get access to these FP10 classes - or does the version of the outermost wrapper SWF always determine what’s available to child SWFs? It seems odd that the FP10 classes are not available in a FP10 player.

Thanks for any help,
James