>>Select all works, as does unselect all because those cases are handled as checkbox events. I am now dealing with a scenario where if a user selects too many items I clear all selections programmatically and prompt for fewer selections, just cannot figure out how to clear the checkbox of the 'tick'.
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>Is your Checkbox column bound to the data? If yes, how and then you update the underlying data?

Our checkbox column is bound to a boolean column that is added to the datatable at runtime. We just loop through the table setting the column as appropriate.