require 'tkmove3.rb'
include TestBed

c = TkCanvas.new.pack
testbed( c )

label = TkLabel.new.pack
TkButton.new(nil, 'text'=>'bbox', 'command'=>proc{
  c.delete('bbox')
  c.dtag('bbox')
  coord = c.bbox('item') # all items created by the TkDraw has the 'item' tag
  label.text( coord.inspect )
  eval( "TkcRectangle.new(c, " + coord.join(',') + ").addtag('bbox')" )
}).pack

Tk.mainloop