code: function (name) {
          var self = this, args = Tools.toArray(arguments).slice(1);
  
          self.each(function (item) {
            if (item[name]) {
              item[name].apply(item, args);
            }
          });
  
          return self;
        }
docs: Executes the specific function name with optional arguments an all items in collection if it exists.
  
  @example collection.exec("myMethod", arg1, arg2, arg3);
  @method exec
  @param {String} name Name of the function to execute.
  @param {Object} ... Multiple arguments to pass to each function.
  @return {tinymce.ui.Collection} Current collection.