def colorize_default(cls, field):
        """
        Convenience method for white coloring.
        :param field: Field handler.
        :return:
        """
        if isinstance( field, QtWidgets.QLineEdit):
            cls.colorize(field, ValidationColors.white.value)
        if isinstance( field, QtWidgets.QComboBox):
            cls.colorize_frame(field, ValidationColors.grey.value)