title: Dataset Field in Header/Footer disappears in PDF Export
body: <p>I've been asked to make a small change to one of our RDLs. Essentially, I have some fields in my header/footer which pull information out of the resulting dataset (this is done by creating hidden textbox in the report body, then creating a textbox in the footer with its value set to <code>ReportItems!txtHiddenMsg.Value</code>).</p>
  
  <p>Unfortunately, the message in the footer is dynamic: it displays a customerID and a custom "Thank you for your business" message in the customer's native language in the footer, and there are several customer IDs contained in the report, so the footer text actually changes from page to page. This means its not possible to hard code the text in the footer or bind it to a different dataset.</p>
  
  <p>The report renders just fine in ReportViewer, but the fields disappear when exported to PDF. I don't know how to phrase this problem, so I apologize if this is worded awkardly:</p>
  
  <p><strong>How can I bind a field in the header/footer to a dataset field and without the field disappearing from the PDF export?</strong></p>