That's what I'd like to do. However I'm not clear how to detect the start of a request from within a component. To explain - I put a #halt in children and found that it was called five times, for one request. I was hoping that I could hook into a message that marked the start of a request - as #initialRequest isn't suitable is there some other call? Failing that, would it confuse the calling components to return a different set of objects for each of the five calls to #children?

Nick