FarPoint.Win.Spread.StyleInfo si = new FarPoint.Win.Spread.StyleInfo();
DialogResult dlg;
si.Locked = true;
fpSpread1.ActiveSheet.DefaultStyle = si;
dlg = MessageBox.Show("Reset the locked?");
if (dlg == DialogResult.OK)
{
si.ResetLocked();
fpSpread1.ActiveSheet.DefaultStyle = si;
}