Flex's FileReference.save() can only be called in a user event handler — how can I get around this?

Question

I need to call FileReference.save() after a web service call has completed, but this method has a restriction: \"In Flash Player, you can only call this method successfully

Answer 1

As a workaround I used the ExternalInterface class. I created a javascript function with this code

function downloadFile (url) {
            window.open(url);
        }

An in AS3 I call

var url = 'www.example.com/downloadfile.php?file_id=xxx';
ExternalInterface.call('downloadAttachmentFile', url);

So with that I transfer the file handling to JS/HTML.