Problem

I've just being playing with focusable, and it's just occured to me...

Since lib.focusable's static holds an array reference to all the focusables,
supposing you 'deparented' (read: wanted to dispose) of a focusable, it will
not get garbage collected because it's still referenced.

There's no way to tell from within lib.focusable whether or not an
instantiation has a parent or not and, in the latter case, drop the
reference accordingly.

What this means is that when a large XWT app with lots of dynamic box
creation/dismissal, it'll eat memory for breakfast because it won't be
relinquishing a lot of it's supposedly disposed boxen.
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