[Zope-dev] no reload of image in management interface of python product

hello all i have a python product with an image as a property now i display the image in the management screen, but when i change the image via the management interface the browser does no refresh of the image is set the mod time like this: self.doc_icon.lmt=time.time() self.doc_icon.lmh=rfc1123_date(self.doc_icon.lmt) doc_icon is a ImageFile so the date changes but the browser doesn't update this do i have to add something in the http header of the management page or so please help -- bernd