Onion, part 3 (teaser)

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Seeing as I haven't had enough free time to write part 3 recently I thought I'd post this little teaser. Would it surprise you to know that this very diagram generated into code and I was able to run it?

The signals on the ShowWelcomeMessage had to be hand coded, but hopefully I will be able to get some kind of custom code generation plugin to get the signals auto generated in future.

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