Make down arrow behave like tab key

[Kaveh Bazargan]

I have several fields in a stack and I want to be able to navigate through
them using up and down arrow keys (I find shift tab not friendly). So how
can I make down arrow act like tab, and up arrow act like shift-tab?

I have tried

on arrowKey theKey
    if theKey is "down" then
      tabKey
    end if
  end if
end arrowKey

But tabKey handler is not found. Also tried

send tabKey to fld ...

etc.
-- 

Kaveh Bazargan
http://www.river-valley.com/
http://www.holographer.org/