Got no answer so I post it again ;) Why don't extend the attempt made by the manager's release method? I think it is a kind of reference counted self destruction of blocks, isn't it? And thats all we need. When all blocks in a manager are disposed it could notify the embeddor (or whatever else- through an event handler), which could then shutdowns itself. So you could shutdown your app simply by calling dispose on your app's top level component.
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