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refresh the footer on cell value change by user

i am using Grid.attachFooter(.......,{#stat_total},....});

it gives me a total calculation on grid load. How can I refresh the footer to get new value of #stat_total when I changing some grid cell value?

Thanks.

If cell changed by user actions ( edited ) - footer value will recalculate automatically. 
If you are changing value by API , you may force footer recalculation by 
         grid.callEvent("onGridReconstructed",[])

thank you! it works now!