FarPoint.Win.Spread.StyleInfo si = new FarPoint.Win.Spread.StyleInfo();
DialogResult dlg;
si.CellType = new FarPoint.Win.Spread.CellType.CheckBoxCellType;
fpSpread1.ActiveSheet.DefaultStyle = si;
dlg = MessageBox.Show("Reset the celltype?");
if (dlg == DialogResult.OK)
{
si.ResetCellType();
fpSpread1.ActiveSheet.DefaultStyle = si;
}