class_docstr: Base class used to display multiple child widgets.
docstr: Sets the title of a container page.
  Parameters
  ----------
  index : int
      Index of the container page
  title : unicode
      New title
docstr_tok: ["Sets","the","title","of","a","container","page",".","Parameters","--","--","--","--","--","index",":","int","Index","of","the","container","page","title",":","unicode","New","title"]
code: def set_title(self, index, title):
      """Sets the title of a container page.
      Parameters
      ----------
      index : int
          Index of the container page
      title : unicode
          New title
      """
      titles = list(self.titles)
      # for backwards compatibility with ipywidgets 7.x
      if title is None:
          title = ""
      titles[index] = title
      self.titles = tuple(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 6 for calling the _SelectionContainer obj's underlying member method code with example usage: obj.set_title(index, title) without return types