code: def itemListContextMenuEvent(self, ev):
      self.menuItem = self.itemList.itemAt(ev.pos())
      self.menu.popup(ev.globalPos())
  
imports: import gc
  import importlib
  import weakref
  import warnings
  from ..graphicsItems.GridItem import GridItem
  from ..graphicsItems.ROI import ROI
  from ..graphicsItems.ViewBox import ViewBox
  from ..Qt import QT_LIB, QtCore, QtGui, QtWidgets
  from .None import CanvasTemplate_generic
  from .CanvasItem import CanvasItem, GroupCanvasItem
  from .CanvasManager import CanvasManager
label_desc: Use image node_id 33 for calling the Canvas obj's underlying member method code with example usage: obj.itemListContextMenuEvent(ev) without return types