Hi Natasha,
You could specify the required character in the text property of the grid cell. See the code:
this.gridControl1[0, 1].Text = "A";// column header cell
this.gridControl1[0,2].Text = "Ā"; // column header cell
See the sample:
http://files.syncfusion.com/support/Grid.Windows/F84292.zipPlease let me know if this helps.
Regards,
Jisha