Creates a new editor for the given parent and operator.
        
        :param      parent      | <QWidget>
                    operator    | <str>
                    value       | <variant>

def createEditor(self, parent, column, operator, value):
        """
        Creates a new editor for the given parent and operator.
        
        :param      parent      | <QWidget>
                    operator    | <str>
                    value       | <variant>
        """
        if type(value) == datetime.timedelta:
            editor = XTimeDeltaEdit(parent)
            editor.setAttribute(Qt.WA_DeleteOnClose)
            editor.setDelta(value)
            return editor
        
        else:
            editor = super(DateTimePlugin, self).createEditor(parent,
                                                              column,
                                                              operator,
                                                              value)
        
            if isinstance(editor, XDateTimeEdit) or \
               isinstance(editor, XDateEdit):
                editor.setCalendarPopup(True)
            
            return editor