A while back I encountered a problem with datagrids not correctly redrawing
(its a long story). One of the LC team suggested this code (in the card
script) to force a screen redraw:

command RedrawCard
   # forces a card redraw by the Engine
   set the backcolor of me to the backcolor of me
end RedrawCard

It fixed the problem that I was having. I agree with Richard that, in
general, locking and unlocking the screen is the standard approach to
forcing a screen update. 


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