Merge branch 'master' of https://github.com/davidstutz/bootstrap-multiselect

js/bootstrap-multiselect.js

@@ -517,6 +517,10 @@
 
             this.$ul.append($li);
 
+            if ($(group).is(':disabled')) {
+                $li.addClass('disabled');
+            }
+
             // Add the options of the group.
             $('option', group).each($.proxy(function(index, element) {
                 this.createOptionValue(element);