Thank you for writing.
Indeed, setting the BackColor of the TableElement is the right way to introduce the desired color setting. Since by default the GradientStyle is set for Linear, you would need to set the 4 back colors as Mahmoud suggested. Or, alternatively, you can set the GradientStyle to Solid:
radGridView1.TableElement.GradientStyle = GradientStyles.Solid
radGridView1.TableElement.BackColor = Color.Red
@Mahmoud, thank you for the community effort. I have updated your Telerik Points
Check out the Telerik Platform - the only platform that combines a rich set of UI tools with powerful cloud services to develop web, hybrid and native mobile apps.