Hi Fernando,
Thank you for writing.
Once you have populated the GridViewMultiComboBoxColumn with data, in order for a cell to display a value from the column data source, you should set the cell Value property to a corresponding value. For example your column have values "val1", "val2", "val3", and you want the cell in the first row to show "val2", you just need to set its Value property:
I hope this helps.
Regards,
Stefan
Telerik
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