Io chokes on sample code

io
Io 20110905
Io> Account := Object clone do(
... balance := 0.0
... deposit  := method(v, balance = balance + v)
... withdraw := method(v, balance = balance - v)
... show := method(writeln("Account balance: $", balance))
... )
==>  Account_0x866af20:
  balance          = method(...)
  type             = "Account"

Io> myAccount := Account clone
==>  Account_0x867a010:

Io> myAccount show

  Exception: Account does not respond to 'show'
  ---------
  Account show                         Command Line 1

Why the error?

Does it have something to do with the do( ) construct?

The example I use is from:
http://www.iolanguage.com/about/samplecode/