public Component getTableCellRendererComponent(JTable table, Object value,
			boolean isSelected, boolean hasFocus, int row, int column) {
		JLabel l = (JLabel) super.getTableCellRendererComponent(table, value,
				isSelected, hasFocus, row, column);
		if (hasFocus && table.isCellEditable(row, column))
			return l;
		if (!"".equals(value))
			return l;
		l.setText(toSubstitute);
		return l;
	}