Thank you for writing.
You can achieve this task by subscribing you RadGridView
to the CellValueChanged
and in the handler iterate the selected rows and set the values of the cells in your combo column:
sender, GridViewCellEventArgs e)
].Value != e.Value)
].Value = e.Value;
Please also check the following documentation article: Iterating Rows
I hope this helps. Should you have further questions please do not hesitate to write back.
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