How to avoid screen flash when access many cells in matrix?

Hi,
I need to do some automation in the matrix, I need access some cells one by one and assign value to some cells too. When this action only touch 1-2 cells, then the screen flash is acceptable, but if too many cells touched like more than 5, then the matrix flashing become pretty ugly. My question is can this flash be avoided?
Thanks!
Lan

Hi ZHANGLAN     
Use form.freeze()
form.freeze(true)
'your code
form.freeze(false)
Hope this will help you
Regards
Arun

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