// set column widths
for (int i = 0; i < NUM_COLS; i++) {
TableColumn col = _table.getColumn(COLUMN_NAMES[i]);
col.setPreferredWidth(COLUMN_WIDTHS[i]);
col.setCellRenderer(new NumericCellRenderer(COLUMN_CLASSES[i]));
}
_table.getSelectionModel().clearSelection();
_deleteButton.setEnabled(false);
}