private void Start()
 {
     PortiaVM = new PortiaViewModel();
     NotifyPropertyChanged("PortiaVM");
     DtcVM = new DtcViewModel();
     NotifyPropertyChanged("DtcVM");
     ReconVM = new ReconViewModel();
     NotifyPropertyChanged("ReconVM");
     AsyncServiceCall();
 }
 public void Start()
 {
     if (IsStarted == false)
     {
         PortiaVM = new PortiaViewModel();
         NotifyPropertyChanged("PortiaVM");
         DtcVM = new DtcViewModel();
         NotifyPropertyChanged("DtcVM");
         ReconVM = new ReconViewModel();
         NotifyPropertyChanged("ReconVM");
         MismatchedVM = new MismatchedViewModel();
         NotifyPropertyChanged("MismatchedVM");
         AsyncServiceCall();
         IsStarted = true;
     }            
 }