void dataGrid2_MouseDoubleClick(object sender, MouseButtonEventArgs e) {
            var dg = (DataGrid) sender;
            var item = e.FindDataGridItem<IStatus>();
            if (item == null)
                return;

            dg.RowDetailsVisibilityMode = dg.RowDetailsVisibilityMode == DataGridRowDetailsVisibilityMode.Collapsed
                ? DataGridRowDetailsVisibilityMode.Visible
                : DataGridRowDetailsVisibilityMode.Collapsed;
            e.Handled = true;
        }