[racket] Additional GUI components?

I was wondering if there are currently any plans in adding more components
to the GUI toolbox? Things like tree views, property lists, accordion
panels, resizable panels (DrRacket seems to have this in its editor/repl
panel but I don't think it's documented or available?).

I can probably do a semi-functional implementation of those myself but if
there are already plans about adding those in the toolkit in the near future
I'd rather spare the effort.

-- 
tomppa
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