Count returns the number of filtered columns in the current range. Items[Field] and Find(Field) return a TXLSAutofilterItem for that field or nil when the field index is outside the current range
Active, Operator, Criteria1, and Criteria2. Criteria objects expose the stored BIFF8 DOPER DataType, grbitSgn, and Value
Sheet.ApplyAutoFilter('A1:C5', 2, '>=100');
FilterItem := Sheet.AutoFilterColumns.Find(2);
if Assigned(FilterItem) and FilterItem.Active then
CriteriaValue := FilterItem.Criteria1.Value;