How do I do this?

I have this recurring pattern that pier doesnt appear to handle at all well, so would be grateful for ideas. I want to embed a component that "does stuff" then when it is finished goes back to, whence it came. Better still I would like to be able to go to a page, with an embedded component, and when finished return to the place of origin. This would allow the component to be decorated with other things on that page, rather than just being a dry form like Commands are. (although Pier-Annotations can spice them up a bit) For example, I have a "New User Registration" component written for seaside. It would normally be invoked via a "call", and would return something or nil if the user cancelled. I am not so interested in the return value. So if I pop this component in to pier, I can get to it via a link, and when I have finished "doing stuff", or if I click "cancel", then it does... nothing. Ideally I want it to go back to the source of the link, from whence I came. I have never found a non-hacky way of doing this. The only clean way of doing such things appears to be to wrap your component into a command. I was kind of hoping that LightBox links could be persuaded to close if the component drawn answers nil. Solution's I have contemplated... 1) Have contexts keep a history so at least you can find out where to return to. Have pier handle all seaside components not just root components, any answers that are received from a component, are put into PRContext-properties in case anyone cares, and embedded components may propagate their answers out to the PRContentsWidget which then uses the History in the PRContext to go back to whence you came. 2) Some special form of link, which stores the current structure somewhere, before going to the next destination. any ideas? Keith