void _tree_DoubleClick(object sender, EventArgs e)
        {
            if (_tree.Selection.Count > 0 && _tree.Selection[0].Tag.ToString().EndsWith(".xml"))
            {
                var viewModel = ViewModel.ParentViewModel;
                viewModel.CurrentDashboard = _tree.Selection[0].Tag.ToString();

                Messenger.Default.Send <DashboardMessage>(DashboardMessage.View());
            }
        }