subreport linking parameters

[AlexB1234]

I have a report with a subreport and I'm trying to retrieve the linking values, which appear to be nothing more than parameter fields, in the Drill() event so that I can redirect the browser to a custom page.

I've tried accessing the linking parameters like so:
crParameterFieldDefinitions = crReportDocument.DataDefinition.ParameterFields()
crParameterFieldDefinition = crParameterFieldDefinitions.Item("Pm-BILLING_ENTRIES.DS_FSCL_YEAR&quot
' Has no value!
If crParameterFieldDefinition.CurrentValues.Count > 0 Then
Dim pval As New ParameterDiscreteValue()
Response.Write("Values for " & crParameterFieldDefinition.Name & ":&quot
For Each pval In crParameterFieldDefinition.CurrentValues
Response.Write(pval.Value)
Next
End If

However, the parameter has no value.

Anyone have any ideas on how to do this? Or know how to access the value of a fieldobject? I noticed there's no .Value property.