次のサンプルコードは、AutoFilterIndexプロパティを設定します。
FarPoint.Win.Spread.ColumnHeader ch;
ch = fpSpread1.ActiveSheet.ColumnHeader;
ch.RowCount = 3;
fpSpread1.ActiveSheet.Columns[1].AllowAutoFilter = true;
fpSpread1.ActiveSheet.Columns[1].AutoFilterIndex = 1;
Dim ch As FarPoint.Win.Spread.ColumnHeader
ch = FpSpread1.ActiveSheet.ColumnHeader
ch.RowCount = 3
FpSpread1.ActiveSheet.Columns(1).AllowAutoFilter = True
FpSpread1.ActiveSheet.Columns(1).AutoFilterIndex = 1