Adding custom fields to Advanced Search criteria

I've now added several new fields to the HelpDesk worker console (and also the workitem table), but none of these show up as options to select in the Advance Search criteria drow-down list. I can see the DataStore being loaded with the following code



DataStore("AdvancedCriteriaDS") = New DataSet

DataStore("AdvancedCriteria") = New CriteriaTable("CriteriaFields.xml", False, True)

DataStore("AdvancedCriteriaDS").Tables.Add(DataStore("AdvancedCriteria"))

DataStore("AdvancedCriteria").Initialize()



and I've discovered that I am not able to update the "CriteriaFields.xml" file. Therefore, I would like to add rows to the Table directly. Does anyone know how to

1) determine the necessary fields for this table

2) add the rows to the table?



Any help would be greatly appreciated.