Issue with sc_redir in blank app

Hi all,

I created a button in a form (form_document), which opens a blank form with code for downloading a file, like I found elsewhere in this forum:

In the php of the button:
sc_redir(form_document_download,filename=$dl_file;dl_filename=$dl_filename);

In onExec:

//--------------------------------------

header(‘Pragma: public’);
header(‘Expires: 0’);
header(‘Cache-Control: must-revalidate, post-check=0, pre-check=0’);
header(‘Cache-Control: private’, false); // required for certain browsers
header(‘Content-Type: application/docx’);

header(‘Content-Disposition: attachment; filename="’. [dl_filename] . ‘";’);
header(‘Content-Transfer-Encoding: binary’);
header('Content-Length: ’ . filesize([filename]));

readfile([filename]);

sc_redir(form_document);

//--------------------------------------

The download of the file works fine, but the form remains grey and doesn’t return back to form_document.

What do I do wrong?

Thanks,
Martin