FileFormat-Plugin: Writing multi layer image

Hi,

I've another problem with a FileFormat-Plugin.

I want to write multiple layers to a file.

The plugin is correctly supporting format layers and is receiving the "writeLayerStart" event.

There I can see the that PS is giving me the background layer and I'm writing it to the file.

But after that I receive the "writeFinish" event.

All other layers are ignored.

Is there anything I should set in the FormatRecord so PS will give me the next layer?

Thanks in advance,

Christian