code: def viewBox(self):
      return self._vb
  
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 FlowchartGraphicsView obj's underlying member method code with example usage: obj.viewBox() and returns: self