docs: function () {
              // get value
              var val = this.getContextValue();
  
              var target,
                  targets = this.$.root.getTargets();
              if (targets) {
                  for (var i = 0; i < targets.length; i++) {
                      target = targets[i];
                      if (target.key instanceof Function) {
                          target.key.call(target.scope, val, this);
                      } else {
                          target.scope.set(target.key, val);
                      }
                  }
              }
  
          }