private void ReplyButton_Tap(object sender, System.Windows.Input.GestureEventArgs e)
{
var vm = this.DataContext as CommentViewModel;
vm.GotoReply.Execute(null);
var replyData = vm.ReplyData;
if (SimpleIoc.Default.IsRegistered<ReplyViewModel>())
SimpleIoc.Default.Unregister<ReplyViewModel>();
SimpleIoc.Default.Register<ReplyViewModel>(() => replyData, true);
var _navigationService = ServiceLocator.Current.GetInstance<INavigationService>();
_navigationService.Navigate(typeof(ReplyViewPage), null);
}