toggle method on button is undefined?

[Ray Case]

simple code snippet:

Shoes.app :title => "Testing!" do

  @play    = button("play",  :width=> "100px")
  @toggle  = button("toggle",  :width=> "100px")

  @toggle.click {
    @play.toggle()
  }

end


I am using button.toggle for the first time, however when my code hits
the @play.toggle(), Shoes throws "undefined method 'toggle' for
(Shoes::Button):Shoes::Button" - I am assuming this is a bug?...
Also, based on this post, I have a feature request: it would be nice to be
able to cut and past from the 'Shoes Console'

Thanks,
Ray Case