WPF UI Freeze using Task

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WPF

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Hello Guys

I am not sure what i misses here been doing this for days. Hope someone can help me out.

What I want is that I have a progress loading while constructing the data and binding it.

I am doing this inside UserControl_Loaded.

Other Notes:
-this loading adorner is taken from this
WPF Loading Wait Adorner[^]

((MainWindow)dp).LoadingAdorner.IsAdornerVisible = true;

   DependencyObject dp = this._owner;
  //shows the loading but freezes and loading not moving
  //from here

  ((MainWindow)dp).LoadingAdorner.IsAdornerVisible = true;
  //to here

  Person person = new Person();
  List<Address> addresses= new List<Address>();
  List<Contact> contacts = new List<Contact>();
  Employee emp = new Employee();
  List<Role> roles= new List<Role>();
  List<string> nationalities = new List<string>();

  List<Task> tasks = new List<Task>();

  Task taskPerson = Task.Factory.StartNew(() =>
  {
      this.Dispatcher.BeginInvoke(new Action(() =>
      {
          var personSvcAgent = new ServiceAgent.PersonSvcAgent();
          person = personSvcAgent.GetPersonById(_employeeModel.OwnerID);

      }), null);
  });
  tasks.Add(taskPerson);

  Task taskContact = Task.Factory.StartNew(() =>
  {
      this.Dispatcher.BeginInvoke(new Action(() =>
      {
          var contactSvcAgent = new ServiceAgent.ContactSvcAgent();
         contacts = contactSvcAgent.GetContactByOwnerId(person.Id);
      }), null);
  });
  tasks.Add(taskContact);

  Task taskAddress = Task.Factory.StartNew(() =>
  {
      this.Dispatcher.BeginInvoke(new Action(() =>
      {
          var addressSvcAgent = new ServiceAgent.AddressSvcAgent();
          addresses = addressSvcAgent.GetAddressByOwnerId(person.Id);
      }), null);
  });
  tasks.Add(taskAddress);


Task taskEmployee = Task.Factory.StartNew(() =>
  {
      this.Dispatcher.BeginInvoke(new Action(() =>
      {
          var employeeSvcAgent = new ServiceAgent.EmployeeSvcAgent();
          emp = employeeSvcAgent.GetEmployeeById(_employeeModel.EmployeeId);
      }), null);
  });
  tasks.Add(taskEmployee);

 Task taskRoles = Task.Factory.StartNew(() =>
  {
      this.Dispatcher.BeginInvoke(new Action(() =>
      {
          roles = new RoleSvcAgent().GetAllRole();
          nationalities = Nationalities.GetAllNationalities();
      }), null);
  });
  tasks.Add(taskRoles);

  var ui = TaskScheduler.FromCurrentSynchronizationContext();
  Task.Factory.ContinueWhenAll(tasks.ToArray(),result =>
  {
      //when i put the code here it will load all the person info before it shows the loading
      //from here
      ((MainWindow)dp).LoadingAdorner.IsAdornerVisible = true;
      //to here

      LoadPersonInfo( person);

  }, CancellationToken.None, TaskContinuationOptions.None, ui);