FarPoint.Win.Spread.Model.DefaultSheetAxisModel dsam = new FarPoint.Win.Spread.Model.DefaultSheetAxisModel();
object o;
dsam = (FarPoint.Win.Spread.Model.DefaultSheetAxisModel)fpSpread1.ActiveSheet.Models.ColumnAxis;
dsam.SetTag(2, "TestTag");
o = dsam.GetTag(2);
listBox1.Items.Add(o.ToString());