code: def getMenu(self, ev):
      ## called by ViewBox to create a new context menu
      self._fc_menu = QtWidgets.QMenu()
      self._subMenus = self.getContextMenus(ev)
      for menu in self._subMenus:
          self._fc_menu.addMenu(menu)
      return self._fc_menu
  
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 2 for calling the FlowchartViewBox obj's underlying member method code with example usage: obj.getMenu(ev) and returns: self