@Override
	public Class<?> getColumnClass(int column) {
		switch (column) {
		case ProjectTableModel.COLUMN_COLOR:
			return Color.class;
		case ProjectTableModel.COLUMN_CREATED:
			return Date.class;
		case ProjectTableModel.COLUMN_TIMEOVERALL:
		case ProjectTableModel.COLUMN_TIMETODAY:
			return Integer.class;
		case ProjectTableModel.COLUMN_CHECK:
		case ProjectTableModel.COLUMN_ACTION_DELETE:
		case ProjectTableModel.COLUMN_ACTION_STARTPAUSE:
			return Boolean.class;
		default:
			return String.class;
			//return getValueAt(0, column).getClass();   // WARNING: sorter would throw exception!
		}
	}