code: function (id) {
                  var plugin = null;
                  util.each(this.get('plugins'), function (p) {
                      // user defined takes priority
                      var pluginId = p.get && p.get('pluginId') || p.pluginId;
                      if (pluginId === id) {
                          plugin = p;
                          return false;
                      }
                      return undefined;
                  });
                  return plugin;
              }
docs: get specified plugin instance by id
  @param {String} id pluginId of plugin instance
  @return {Object}