fpSpread1.Sheets[0].Cells[0, 1].Value = 30;
fpSpread1.Sheets[0].Cells[1, 1].Value = 15;
fpSpread1.Sheets[0].Cells[2, 1].Value = 10;
FarPoint.Win.Spread.Top10FilterItem top10filter = new FarPoint.Win.Spread.Top10FilterItem(true, 5, false);
FarPoint.Win.Spread.IRowFilter rowFilter = new FarPoint.Win.Spread.HideRowFilter(fpSpread1.ActiveSheet);
FarPoint.Win.Spread.FilterColumnDefinition fd = new FarPoint.Win.Spread.FilterColumnDefinition(1, FarPoint.Win.Spread.FilterListBehavior.Custom);
fd.Filters.Add(top10filter);
rowFilter.ColumnDefinitions.Add(fd);
fpSpread1.ActiveSheet.RowFilter = rowFilter;
fpSpread1.ActiveSheet.AutoFilterColumn(1, top10filter.DisplayName, 0);
fpSpread1.ActiveSheet.AutoFilterMode = FarPoint.Win.Spread.AutoFilterMode.EnhancedContextMenu;