docs: function (list) {
              var comps = list.split(rlist),
              i = 0, l = comps.length,
              comp;
  
              //loop over the list of components and add if needed
              for (; i < l; ++i) {
                  comp = comps[i];
                  if (!this.has(comp)) this.addComponent(comp);
              }
  
              return this;
          }