message: chache mappedcontrols
diff: @@ -410,16 +410,28 @@ export class GroupControl extends React.PureComponent<ParamProps<PD.Group<any>>,
  }
  export class MappedControl extends React.PureComponent<ParamProps<PD.Mapped<any>>> {
  + private valuesCache: { [name: string]: PD.Values<any> } = {}
  + private setValues(name: string, values: PD.Values<any>) {
  + this.valuesCache[name] = values
  + }
  + private getValues(name: string) {
  + if (name in this.valuesCache) {
  + return this.valuesCache[name]
  + } else {
  + return this.props.param.map(name).defaultValue
  + }
  + }
  +
  change(value: PD.Mapped<any>['defaultValue'] ) {
  this.props.onChange({ name: this.props.name, param: this.props.param, value });
  }
  onChangeName: ParamOnChange = e => {
  - // TODO: Cache values when changing types?
  - this.change({ name: e.value, params: this.props.param.map(e.value).defaultValue });
  + this.change({ name: e.value, params: this.getValues(e.value) });
  }
  onChangeParam: ParamOnChange = e => {
  + this.setValues(this.props.value.name, e.value)
  this.change({ name: this.props.value.name, params: e.value });
  }
  