private void fillConceptTable(Bill r, Student s, JTable table) {
		DefaultTableModel dtm = (DefaultTableModel) table.getModel();
		for (int i = 0; i < dtm.getRowCount(); i++) {
			dtm.removeRow(i);
		}

		Set<BillLine> billLines = billService.getBillLinesByStudent(r, s);
		for (BillLine rl : billLines) {
			Object[] data = { rl.getConcept(), rl.getUnitPrice(), rl.getUnits() };
			dtm.addRow(data);
		}

		//table.updateUI();
	}