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grid[0, colIndex].HorizontalAlignment = GridHorizontalAlignment.Left;
More generally, you can loop through the column styles and set the style o fthe header cell to match the style of the column.
//in a gridcontrol for(int i = 1; i <= grid.ColCount; ++i) grid[0, i].HorizontalAlignment = grid.ColStyles[i].HorizontalAlignment; //in a griddataboundgrid //if you have not added GridBoundColumns for(int i = 1; i <= grid.Model.ColCount; ++i) grid[0, i].HorizontalAlignment = grid.Binder.InternalColumns[i-1].HorizontalAlignment; //in a griddataboundgrid //if you have added GridBoundColumns for(int i = 1; i <= grid.Model.ColCount; ++i) grid[0, i].HorizontalAlignment = grid.GridBoundColumns[i-1].HorizontalAlignment;