Subreport not refreshing upon datasource change

[ebutter]

V.10
xml data using ADO.NET driver

I have a report that uses a subreport inserted in Group Header 1 to obtain a value that would not otherwise be available.

Although the report works when I change my datasource and hit update for both the main and subreports, the old subreport value still appears on the main report. If I hit refresh it then updates.

Is there anyway to force a refresh when the datasource changes?

Thanks!