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 update_annotation(self):
      self.annotation_dlg.Label = ""
      if self.orig_choices:
          ch = self.orig_choices[self.combo_dlg.GetSelection()]
          self.annotation_dlg.Label = self.get_choice_label(ch)
  
imports: import platform
  import wx
label_desc: Use image node_id 6 for calling the NameSubscriberComboBox obj's underlying member method code with example usage: obj.update_annotation() without return types