Any way to add custom data to a channel?

Hi,

I need to save some customized data to a spot channel, but didn't find out how to do it.

I created the spot channel by 'sPSActionControl->Play(&result, eventMake, descNewSpotChannel, plugInDialogSilent)', and I've tried to put string into the descriptor by key 'keyCustomForced' or 'keyCustom', but none of the keys worked.

Any suggestion will be greatly appreciated.

Thanks a lot!

Daniel