Angular 2 settimeout это не определено

Я пытаюсь настроить setTimeout внутри переключателя, который находится внутри foreach, внутри функции ...

TypeError: undefined не является объектом (оценка this.Data)

я пытался

import { DataProvider } from '../xml-provider';
constructor(private Data: DataProvider) { }
items = this.Data.xmldata['step'];  //XML turned into array using 

initiateStepActions(){
    var actionsToTake = this.items[this.currentStep]['timed_actions'];
    if (actionsToTake){
        this.items[this.currentStep]['timed_actions'][0]['action'].forEach(function(foundAction){
          switch (type) {
            case 'customerchat':
              var MesgObject = {text : foundAction['_']};
              //setTimeout(() => {this.Data.broadcastCustomerChatMesg(MesgObject)}, Number(foundAction['$']['showAtSecond']));
              //setTimeout (() => this.Data.broadcastCustomerChatMesg(MesgObject), Number(foundAction['$']['showAtSecond']));
              //setTimeout ( (this.Data.broadcastCustomerChatMesg(MesgObject)).bind(this), Number(foundAction['$']['showAtSecond']));
              //setTimeout (this.Data.broadcastCustomerChatMesg(MesgObject), Number(foundAction['$']['showAtSecond']));
              setTimeout (function(this) { this.Data.broadcastCustomerChatMesg(MesgObject)}, Number(foundAction['$']['showAtSecond']));

              TypeError: undefined is not an object (evaluating 'this.Data.broadcastCustomerChatMesg')
              break;

            case 'supportchat':
              console.info('send a support chat message ');
              break;

            default:
              console.info('defaulted');
          } //end switch
    });// end foreach
  }
}

Все они получают неопределенную ошибку.