class_docstr: Base class used to display multiple child widgets.
code: def _reset_titles(self):
      if len(self.titles) != len(self.children):
          # Run validation function
          self.titles = tuple(self.titles)
  
imports: from .widget_box import Box
  from .widget import register
  from .widget_core import CoreWidget
  from traitlets import Unicode, Dict, CInt, TraitError, validate, observe
  from .trait_types import TypedTuple
  from itertools import chain, repeat, islice
label_desc: Use image node_id 5 for calling the _SelectionContainer obj's underlying member method code with example usage: obj._reset_titles() without return types