Hi Sean,
Thank you for your interest in Syncfusion product.
The CellType of the cells in a column can be assigned, depending upon the range of the cell, is acheived through GridGroupingControl's QueryCellStyleInfo event.
And the display member can be assigned as soon as the DataSource is loaded, this can be attained using CellValue property of the Style object in the QueryCellStyleInfo event.
Please refer the following sample for futher details:
CellTypeSampleLet me know if you have any queries.
Regards,
Nirmal