Sets the hint color for this combo box provided its line edit is
        an XLineEdit instance.
        
        :param      color | <QColor>

def setHintColor(self, color):
        """
        Sets the hint color for this combo box provided its line edit is
        an XLineEdit instance.
        
        :param      color | <QColor>
        """
        lineEdit = self.lineEdit()
        if isinstance(lineEdit, XLineEdit):
            lineEdit.setHintColor(color)