text: # A ScrolledList widget feels like a list widget but also has a
  # vertical scroll bar on its right.  (Later, options may be added to
  # add a horizontal bar as well, to make the bars disappear
  # automatically when not needed, to move them to the other side of the
  # window, etc.)
  #
  # Configuration options are passed to the List widget.
  # A Frame widget is inserted between the master and the list, to hold
  # the Scrollbar widget.
  # Most methods calls are inherited from the List widget; Pack methods
  # are redirected to the Frame widget however.
  
  from Tkinter import *
  from Tkinter import _cnfmerge
  
  class ScrolledListbox(Listbox):
      def __init__(self, master=None, cnf={}):
          cnf = _cnfmerge(cnf)
          fcnf = {}
          vcnf = {'name': 'vbar',
              Pack: {'side': 'right', 'fill': 'y'},}
          for k in list(cnf.keys()):
              if type(k) == ClassType or k == 'name':
                  fcnf[k] = cnf[k]
                  del cnf[k]
          self.frame = Frame(master, fcnf)
          self.vbar = Scrollbar(self.frame, vcnf)
          cnf[Pack] = {'side': 'left', 'fill': 'both', 'expand': 'yes'}
          cnf['name'] = 'list'
          Listbox.__init__(self, self.frame, cnf)
          self['yscrollcommand'] = (self.vbar, 'set')
          self.vbar['command'] = (self, 'yview')
  
          # Copy Pack methods of self.frame -- hack!
          for m in Pack.__dict__:
              if m[0] != '_' and m != 'config':
                  setattr(self, m, getattr(self.frame, m))
  