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First of all, you dont have to code two webservices - your second webservice should be an operation to the first, default webservice.
Second, while you do initiate the first webservice with the load event, you didn't do the same for the second webservice. You should. A simple "availableSlots.getAvailableSlotsForSpeaker.send()" will do.
Thank you for your help.
I suspected that might be the case on combining the web services. I've done that now and updated the references.
I understand the need for speakerData.getAvailableSlotsForSpeaker.send(), but where exactly do I put it? Does it need to be triggered by the click in the first grid or as some attribute of the second grid? Again, I'm still trying to get my head around Flex's event model.
Since you have a binding on the second DG, it doesn't really matter when you activate the send on the webservice. Whenever you do, the second DG will display the results. I would put it on the click as you mentioned but as an ItemRenderer inside the first DG.
I'm sorry I did not reply earlier. You answered my questions and we got he app up and running. Thanks for all your help.