Simulating button click in DialogBox with key event?

I know I'm missing something obvious here, but what's the current
correct approach to catching a keyboard event to close a DialogBox or
do something similar (i.e., simulate clicking the "Save" or "OK"
button)?

I found an older example that uses onNativePreviewEvent() that seems
to be unsupported now, and I've got some other mischief running in a
class derived from FocusPanel that overrides onKeyPress(), but but I
can't seem to get anything working with anything derived from
DialogBox...

Thoughts or advice appreciated.

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