private void DriverHubPage_DataContextChanged(FrameworkElement sender, DataContextChangedEventArgs args)
 {
     vm = DataContext as DriverHubPageViewModel;
     vm.RatingsDataLoaded += Vm_RatingsDataLoaded;
 }
 private void DriverHubPage_DataContextChanged(FrameworkElement sender, DataContextChangedEventArgs args)
 {
     vm = DataContext as DriverHubPageViewModel;
     vm.RatingsDataLoaded += Vm_RatingsDataLoaded;
 }