I am using the latest "nightly" Flex 4.5 SDK, build 17689. It seems the dropShadowEnabled property is no longer supported with the Hero default skin. I get this compilation error:
The style 'dropShadowVisible' is only supported by type 'spark.components.Panel' with the theme(s) 'spark'.
Is there any way to disable the shadow without making a custom panel skin? Now I have shadows on top of shadows as I use panels within other panels, and shadows where I do not need/want them.