If I copy ColorPicker.jsx and ColorPicker.swf to the Plug-ins/Panel, everything works fine.
If I try to build the same with Flash Builder, it does not work: the color is not propagated from the Photoshop foreground/background areas to the Flash panel and vice versa. Seems like events are not registered.
I'm using Flex 3.6, have copied the CSXSLibrary-2.0-sdk-3.4.swc to the libs folder before generating the SWF-file.
My ColorPicker.swf is 402246 bytes. Adobe's SWF-file included in the SDK is 400657.