Enable CheckBoxes in one radGrid after checked in other RadGrid in Telerik

I'm using in Telerik. how can I enable CheckBoxes in one radGrid after checked in other RadGrid.

I'm using -- ClientEvents onSelected="func" -- and then I have finction ib JavaScript run on the other RadGrid. I know to to check them all (set_selected(true))

but I dont know how ot enable them all.

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Thenks!

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