Once you set the Font Facename, I think things should just work. I dropped a GridControl on a form and used this code in FormLoad to see WingDings.
private void Form1_Load(object sender, EventArgs e)
{
this.gridControl1.TableStyle.Font.Facename = "WingDings";
this.gridControl1.RowCount = 16;
this.gridControl1.ColCount = 16;
int c = 32;
for(int i = 3; i <= 16; ++i)
for(int j = 1; j <= 16 ; ++j)
{
this.gridControl1[i, j].Text = ((char)c).ToString();
c++;
}
}