class_docstr: Group parameters are used mainly as a generic parent item that holds (and groups!) a set
  of child parameters. It also provides a simple mechanism for displaying a button or combo
  that can be used to add new parameters to the group.
class_docstr_tok: ["Group","parameters","are","used","mainly","as","a","generic","parent","item","that","holds","(","and","groups","!",")","a","set","of","child","parameters",".","It","also","provides","a","simple","mechanism","for","displaying","a","button","or","combo","that","can","be","used","to","add","new","parameters","to","the","group","."]
code: def treeWidgetChanged(self):
      ParameterItem.treeWidgetChanged(self)
      tw = self.treeWidget()
      if tw is None:
          return
      self.setFirstColumnSpanned(True)
      if self.addItem is not None:
          tw.setItemWidget(self.addItem, 0, self.addWidgetBox)
          self.addItem.setFirstColumnSpanned(True)
  
imports: import builtins
  from ...None import functions
  from ...None import icons
  from ...Qt import QtCore, QtGui, QtWidgets, mkQApp
  from ..Parameter import Parameter
  from ..ParameterItem import ParameterItem
label_desc: Use image node_id 6 for calling the GroupParameterItem obj's underlying member method code with example usage: obj.treeWidgetChanged() without return types