https://sourceforge.net/tracker/?func=detail&aid=3015687&group_id=152762&atid=785194

http://www.zkoss.org/forum/listComment/12694

We can always use Fileupload, or set onUpload on a button, but currently it's not easy to bring up a file browsing window (not fileupload window) by clicking on an image.
Maybe we can provide the upload functionality on some other elements.