Thank you for writing.
When you bind the grid to a collection that contains a read-only property, the respective column that is generated is expected to be read-only as well. Thus, you won't encounter this error message. If you add the column programmatically after setting the RadGridView.DataSource
property, make sure that the column's ReadOnly property is set to true.
I hope this information helps. Should you have further questions I would be glad to help.