FarPoint.Win.Spread.StyleInfo si = new FarPoint.Win.Spread.StyleInfo();
DialogResult dlg;
si.Border = new FarPoint.Win.LineBorder(Color.Red, 2);
fpSpread1.ActiveSheet.DefaultStyle = si;
dlg = MessageBox.Show("Reset the border?");
if (dlg == DialogResult.OK)
{
si.ResetBorder();
fpSpread1.ActiveSheet.DefaultStyle = si;
}