ehynds/jquery-ui-multiselect-widget — pull request #333 by suit (2012-11-14 11:26:36+00:00)
Title: Changed icon to match selectmenu widget

http://wiki.jqueryui.com/w/page/12138056/Selectmenu

Probably the markup of the button should changed too to match the button widget from jQuery UI Core - so it could fit nicely into existing projects.