class_docstr: A read-only combobox with extra annotation, and a context menu.
  
  Mostly the same interface as wx.ComboBox, but choices is a list of (Name,
  Parent, modulenum).
code: def choice_made(self, evt):
      choice = self.orig_choices[self.combo_dlg.GetSelection()]
      self.update_annotation()
      for cb in self.callbacks:
          cb(evt)
      self.Refresh()
  
imports: import platform
  import wx
label_desc: Use image node_id 3 for calling the NameSubscriberComboBox obj's underlying member method code with example usage: obj.choice_made(evt) without return types