Thank you for writing back.
event is the appropriate way to customize the cells. It would be necessary not only the specify the color but also enable drawing the fill color. I would recommend you to have a look at the Cells background formatting
section in the following help article: https://docs.telerik.com/devtools/winforms/gridview/cells/formatting-cells
If you are still experiencing any further difficulties, it would be greatly appreciated if you can provide a detailed explanation about the exact goal that you are trying to achieve. Thus, we would be able to think about a suitable solution and assist you further. Thank you in advance.
I hope this information helps. If you have any additional questions, please let me know.