private void Form1_Load(object sender, EventArgs e)
{
    CheckBoxCellType checkBoxCellType = new CheckBoxCellType();
    fpSpread1.ActiveSheet.Columns[0].CellType = checkBoxCellType;
    fpSpread1.ActiveSheet.OperationMode = OperationMode.MultiSelect;
    fpSpread1.ActiveSheet.SelectionUnit = FarPoint.Win.Spread.Model.SelectionUnit.Row        
    fpSpread1.SelectionChanging += FpSpread1_SelectionChanging;
    fpSpread1.SelectionChanged += FpSpread1_SelectionChanged;
}

private void FpSpread1_SelectionChanged(object sender, SelectionChangedEventArgs e)
{
    SheetView sheetView = e.View.GetSheetView();
    int row = sheetView.ActiveRowIndex;
    fpSpread1.ActiveSheet.AsWorksheet().Cells[row, 0].Value = sheetView.IsSelected(row, 0) ? true : null;
}

private void FpSpread1_SelectionChanging(object sender, SelectionChangingEventArgs e)
{
    if (Control.MouseButtons == MouseButtons.Left)
    {
        Point p = Control.MousePosition;
        p = fpSpread1.PointToClient(p);
        HitTestInformation ht = fpSpread1.HitTest(p.X, p.Y);
        if (ht.Type == HitTestType.Viewport && ht.ViewportInfo.Column == 0)
        {
            return;
        }
        e.Cancel = true;
    }
}