<p>When a field's <xref href="C1.WPF.FlexReport.Field.Calculated" data-throw-if-not-resolved="false"></xref> property is set to true, the control evaluates 

the expression stored in the Text property and stores the result in the Value property, which gets rendered into the report.

This is the field's default property, so when you use a field name in a VBScript expression, you are actually referring to the field's Value property.