You can handle the Grid's dataBound event, which fires after the Grid is loaded with data. If you want to execute logic before it is loaded with data, handle the dataBinding event instead. afterGridRendered can be a common handler used by multiple Grids.
Here's an example, in which 2 Grids use the same afterGridRendered handler: https://dojo.telerik.com/aqEgOJEr
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