Shaun, I'm only throwing this in as I spent half a day one time trying to get a collection to show on a window, had checked everything as you had and eventually discovered that I had forgotten to check the properties of the collection on the window that Display on Tree was set to True - it is set to False when you add the collection by default.
Thanks I am trying to figure out where you mean. Could you give me a little more info on where this is done.
Yes I think Helen has spotted the step that you may've missed. I wrote some instructions on this recently if this is useful to you. Here they are:
Thanks figured it all out and it is working thanks for passing on the knowledge.