docs: function (stateName) {
              var cfg = this._cfg;
              var newState = cfg.skinObject.states[stateName];
              if (newState == null) {
                  this.$logError(this.FRAME_INVALID_STATE, [stateName, cfg.skinnableClass]);
                  return;
              }
              cfg.state = stateName;
              cfg.stateObject = newState.frame;
              this._cssPrefix = ['x', cfg.skinnableClass, '_', cfg.sclass, '_', cfg.state, "_"].join("");
          }