docstr: Called after an item is added to a GLViewWidget. 
  The widget's GL context is made current before this method is called.
  (So this would be an appropriate time to generate lists, upload textures, etc.)
code: def initializeGL(self):
      """
      Called after an item is added to a GLViewWidget.
      The widget's GL context is made current before this method is called.
      (So this would be an appropriate time to generate lists, upload textures, etc.)
      """
      pass
  
imports: from OpenGL.GL import *
  from OpenGL import GL
  from ..None import Transform3D
  from ..Qt import QtCore
label_desc: Use image node_id 25 for calling the GLGraphicsItem obj's underlying member method code with example usage: obj.initializeGL() without return types