There is a funny solution but it works.
The Url Field is called "News_URL", so you add new text field to your report (same size as for the header field) and you put right on top of the other one (You paste "News_URL" without quotes inside it - I suppose that News_URL is already in the record source of the report). Then, you change the Foreground Color to White and change the Fontsize to 1. That is it, the URL won't appear and when you click on the Header field you are actually clicking on the URL field. You might want to add
to the On Click event as the field might disappear.
Regards,
Ali