[Seaside] Confirming a download

[Michel Bany]

I am trying to download some dynamically built file from Seaside with  
user confirmation.
The code looks like this:

	html anchor
		callback: [

				(self confirm: 'This is a huge download, proceed?')
					ifTrue: [self session returnResponse: (WAResponse new  
contentType: 'text/plain';
							 headerAt: 'Expires' put: 'Thu, 01 Jan 1900 12:00:00 GMT';
							 attachmentWithFileName: 'foo.txt';
							 nextPutAll: 'bar';
							 yourself)]

		]; with: 'Download'.

That works fine, except that the dialog remains in the browser when  
the user confirms the download.
I could not find any way to automatically remove the dialog and  
return to the previous screen.
Is there another way to achieve what I want?

Michel.
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