void ICommand.Execute(object parameter)
        {
            var sel  = _viewModel.SelectedItem;
            var list = _viewModel.PointModelList;

            if (list.Remove(sel))
            {
                list.Insert(0, sel);
            }
            _viewModel.SelectedItem = sel;
            _viewModel.RaisePropertyChanged("SelectedItem");
        }
        public void Execute(object parameter)
        {
            var sel  = _viewModel.SelectedItem;
            var list = _viewModel.PointModelList;

            if (list.Remove(sel))
            {
                list.Add(sel);
            }
            _viewModel.SelectedItem = sel;
            _viewModel.RaisePropertyChanged("SelectedItem");
        }