class_docstr: ParameterItem displaying a clickable button.
code: def treeWidgetChanged(self):
      ParameterItem.treeWidgetChanged(self)
      tree = self.treeWidget()
      if tree is None:
          return
  
      self.setFirstColumnSpanned(True)
      tree.setItemWidget(self, 0, self.layoutWidget)
  
file_path: pyqtgraph/pyqtgraph/parametertree/parameterTypes/action.py
imports: from ...Qt import QtCore, QtWidgets, QtGui
  from ..Parameter import Parameter
  from ..ParameterItem import ParameterItem
label_desc: Use image node_id 2 for calling the ActionParameterItem obj's underlying member method code with example usage: obj.treeWidgetChanged() without return types