docs: def createEditor(self, parent, column, op, value):
          """
          Creates a new editor for the parent based on the plugin parameters.
          
          :param      parent | <QWidget>
          
          :return     <QWidget> || None
          """
          try:
              cls = self._operatorMap[nativestring(op)].cls
          except KeyError, AttributeError:
              return None
          
          # create the new editor
          if cls:
              widget = cls(parent)
              widget.setAttribute(Qt.WA_DeleteOnClose)
              projexui.setWidgetValue(widget, value)
              return widget
          
          return None