hack.js

$(function () {
	$('select[data-jms=true]').multiselect({
		open: function(event, ui) {
			//This hack needs to be merged into the real multiselect js.
		    $(this).parent().find('button.ui-multiselect').attr('tabindex', '-1');
		},
		close: function(event, ui) {
		    $(this).parent().find('button.ui-multiselect').focus();
		}
	});
});