[racket] Finding a GUI containee at x,y within a container

Hi all,

Does anyone know what the equivalent of find-snip in pasteboard% would be
for containees within containers?

I'll looking to be able to get the GUI component at a particular (x,y)
within a container. I thought I'd seen a function that would do what I
need, but in looking through the documents I can't find it.

If there is no such function, would the best approach be to find the
inner-most (most-contained?) containee that has an extent covering that
particular (x,y)?

Cheers,

Kieron.
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