Xamarin Forms Telerik RadListView not poplutaing data

I am facing this issue , i have tried many things.

<telerikDataControls:RadListView.ItemTemplate>


<telerikListView:ListViewTemplateCell.View>



</telerikListView:ListViewTemplateCell.View>


</telerikDataControls:RadListView.ItemTemplate>

public class HomeViewModel : ViewModelBase
{

    private List<Activity> _activities;


    private INavigationService _navigationService;

    private IActivitiesService _activitiesService;



    public HomeViewModel(INavigationService navigationService, IActivitiesService activitiesService)
    {

        _navigationService = navigationService;
        _activitiesService = activitiesService;

    }



    public List<Activity> Activities
    {
        get { return _activities; }
        set
        {
            _activities = value;
            OnPropertyChanged();
        }
    }



    public override Task InitializeAsync(object navigationData)
    {

        this.Activities = _activitiesService.GetActivities();
        return base.InitializeAsync(navigationData);
    }


}

But this is working

<ListView.ItemTemplate>



</ListView.ItemTemplate>