status.setCellRenderer(new StatusTableCellRenderer());
status.setComparator(new GeneralComparator("getStatus"));
table_columns.add(status);
super.buildColumns(new DownloadTableModel());
class PopupListener extends MouseAdapter {
JMenuItem start_download, stop_download, cancel_download,
paste_ed2k_links, copy_ed2k_links, column_setup, properties;