code: def getContextMenus(self, ev):
      ## called by scene to add menus on to someone else's context menu
      menu = self.widget.buildMenu(ev.scenePos())
      menu.setTitle(translate("Context Menu", "Add node"))
      return [menu, ViewBox.getMenu(self, ev)]
  
file_path: pyqtgraph/pyqtgraph/flowchart/FlowchartGraphicsView.py
imports: from ..graphicsItems.ViewBox import ViewBox
  from ..Qt import QtCore, QtGui, QtWidgets
  from ..widgets.GraphicsView import GraphicsView
label_desc: Use image node_id 3 for calling the FlowchartViewBox obj's underlying member method code with example usage: obj.getContextMenus(ev) and returns: list