FarPoint.Win.Spread.StyleInfo si = new FarPoint.Win.Spread.StyleInfo();
DialogResult dlg;
si.Font = new Font("Comic Sans MS", 12);
fpSpread1.ActiveSheet.DefaultStyle = si;
dlg = MessageBox.Show("Reset the font?");
if (dlg == DialogResult.OK)
{
si.ResetFont();
fpSpread1.ActiveSheet.DefaultStyle = si;
}