public void append (Widget widget) {

            if (current_col == n_columns) {
                current_col = 0;
                current_row += 1;
            }
            if (current_row == n_rows) {
                pages++;
                current_row = 0;
                new_page ((pages + 1).to_string ());
            }

            debug (@"position: current_col: $current_col current_row: $current_row pages: $pages");

            attach (widget, current_col + (pages*n_columns - 1), current_col + (pages*n_columns - 1) + 1,
                         current_row, current_row + 1, AttachOptions.EXPAND, AttachOptions.EXPAND,
                         0, 0);
            children.append (widget);
            current_col++;

        }