How to update one row in AdvancedDataGrid

My App have a AdvancedDataGrid and it has so much rows. Some
data rows for AdvancedDataGrid has changed and i don't want to
update all rows ... But i don't know how to update one row for my
AdvancedDataGrid
Some body help me ...
Thanks so muchs !

thanks ntsii.
my problem is:
[Bindable]
var dp:ArrayColection = new ArrayColection({...});
<mx:AdvancedDataGrid dataProvider="{dp}">
<mx:groupedColumns>
</mx:groupedColumns>
</mx:AdvancedDataGrid>
//==================================
in my dp have more rows and some time one of them is changed
then i guess the AdvancedDataGrid must build all rows when
it's dataProvider (dp) have changed.
And i don't want to that...
But i am not sure the AdvancedDataGrid buld all rows from
begin to end ... i don't know.. !

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>
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Hi,
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