It depends if you want to add the new column to all the detail grids, or only to the one currently selected.
To add a column to all detail grids, you need to add it to the DetailGridTemplate, and call UpdateDetailGrids on the GridControl.
To add a column to only one detail grid, then you need to set the SynchronizeDetailGrids property on the GridControl to false, get a reference to the DetailGrid in question, and add the column to it.
Imported from legacy forums. Posted by André (had 2942 views)