RBReportControl.DataField
From Xojo Documentation
Property (As String )
aRBReportControl.DataField = newStringValue
or
StringValue = aRBReportControl.DataField
Supported for all project types and targets.
or
StringValue = aRBReportControl.DataField
Supported for all project types and targets.
The name of the field from the data source to bind to the control.