I think this misconception may be in some part based on the HTML event model, where inner "controls" [elements], like the OK button, naturally pass the event on to the parent if they do not handle it themselves. (or the other HTML event model, where the parent control is always given all events and can choose to handle it itself or give it to the relevant child element - in either case, nothing special has to happen for the dialog to handle "tab", since the button clearly isn't interested in it.)
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