docstr: Return a list of this item's children in the scenegraph hierarchy.
code: def childItems(self):
      """Return a list of this item's children in the scenegraph hierarchy."""
      return list(self.__children)
  
imports: from OpenGL.GL import *
  from OpenGL import GL
  from ..None import Transform3D
  from ..Qt import QtCore
label_desc: Use image node_id 6 for calling the GLGraphicsItem obj's underlying member method code with example usage: obj.childItems() and returns: list